An object floats in water with 5/8 of its volume submerged. The ratio of the density of the obkect to that of water is 5/8.
What is meant by density ?
The measure of how densely a material is packed together is called density. As the mass per unit volume, it has that definition.Symbol for density: D or Formula for Density: Where is the density, m is the object's mass, and V is its volume, the equation is: = m/V.How much matter is confined within a volume is determined by density. For an identical size object, a dense object weighs more than a less dense one.A substance that is less dense than water will float on it; a substance that is denser will sink.Density equals mass per unit volume, or D = M / V, is the density equation.To learn more about density refer to
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alculate the total lifting energy required to build this structure from the ground up. you should first use a riemann sum to estimate the total energy to within j joules, and then write and evaluate a definite integral that will calculate the desired energy. be sure to label each piece of the definite integral to show the weight-distance product being constructed, and to specify what each symbol in the integral formula means.
The most basic equation is GPE = m*g*h. GPE = gravitational potential energy in that location (joules j) m = kilogrammes of mass (kg) G stands for gravitational acceleration (m/s2). h = height change h.
What is energy?In physics, energy is the quantitative quality that is transferred to a body or to a physical system. It is recognised in the execution of work as well as in the form of heat and light (from the Ancient Greek: v, enérgeia, "activity"). Energy is a preserved resource; according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed. The joule is the SI's (International System of Units) unit of measurement for energy (J). A moving object's kinetic energy, a potential energy stored by an object (for instance because of its position in a field), the elastic energy contained in a solid object, chemical energy linked to chemical reactions, radiant energy carried by electromagnetic radiation, and internal energy contained within a thermodynamic system are examples of common forms of energy. Energy is constantly being consumed and expended by all living things.
Any stationary object that has mass (referred to as rest mass) also has an equivalent amount of energy (referred to as rest energy), and any additional energy (of any form) that the object acquires above that rest energy will increase the object's total mass just as it increases its total energy. This is known as mass-energy equivalence.
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forensic science 3.05 make a claim about the electrophoresis results and a possible match to a suspect. then, provide evidence and reasoning to support your claim
A recurrent offender is present at work when two crime scene profiles match. This DNA evidence may be used by the police to support other evidence and aid in a criminal prosecution.
Complete DNA profiles provide extremely reliable matches and can be used to prove a suspect's guilt or innocence in a criminal case. After being put into a gel and exposed to an electrical field, the DNA fragments are electrophoretically sorted into different bands. To make these bands visible to imaging methods, a radioactive dye can be used to color them.
DNA fingerprints are produced via gel electrophoresis using samples taken from crime scenes and suspects. A similarity between samples identifies the criminal suspect.
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When two crime scene profiles match, a repeat offender is present at work. The authorities may use this DNA proof to back up other evidence and build a criminal case.
A suspect's guilt or innocence in a criminal case can be established using whole DNA profiles, which offer incredibly reliable matches. The DNA fragments are electrophoretically separated into distinct bands after being placed in a gel and subjected to an electrical field. These bands can be coloured with a radioactive dye to make them apparent to imaging techniques.
Gel electrophoresis is used to create DNA fingerprints from samples obtained from crime scenes and suspects. The criminal suspect is identified by similarities between samples.
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The following 5 sodium control values in unit (mEq/L) were obtained:140, 135, 138, 140, 142Calculate the coefficient of variation?
The coefficient of variation for the 5 sodium control values is 1.61%.
What is coefficient?Coefficient is a numerical value used to express the magnitude of a physical quantity in relation to another physical quantity. It is a constant value used to convert one set of units to another set of units, or to express the relationship between two physical quantities.
The coefficient of variation (CV) is a measure of the variability of a set of values relative to its mean. To calculate the coefficient of variation, we need to calculate the standard deviation of the values.
Standard deviation = √((140-138.2)2 + (135-138.2)2 + (138-138.2)2 + (140-138.2)2 + (142-138.2)2 / 5)
Standard deviation = 2.22
Coefficient of variation = (Standard deviation/mean)*100
Coefficient of variation = (2.22/138.2)*100
Coefficient of variation = 1.61%
Therefore, the coefficient of variation for the 5 sodium control values is 1.61%.
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puck b has five times the mass of puck a . starting from rest, both pucks are pulled the same distance across frictionless ice by strings with the same tension. part a compare the final kinetic energies of pucks a and b . compare the final kinetic energies of pucks and . ka
Pack B has twice the mass of pack A, and thus twice the kinetic energy, but has the same final velocity as pack A.
a. The ultimate kinetic energy of an object is given by the formula KE = 1/2 × m × v². where m is the object's mass and v is its velocity. Since both pucks are pulled at the same distance by a string of the same tension, the final kinetic energy of both pucks will be the same. However, pack B has twice the mass of pack A, so the final kinetic energy is twice that of pack A. The final velocity of the
b. Object is given by the equation v = √(2 × KE / m). Both packs have the same final kinetic energy, but pack B has twice the mass of pack A, so the final velocity is √(2 × KE / mB) = √(2 × KE / (2 × mA)) = √(KE / mA ), which is the square root of the terminal velocity of pack A.
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The question is -
Puck B has twice the mass of puck A. Starting from rest, both pucks are pulled the same distance across frictionless ice by strings with the same tension a. Compare the final kinetic energies of pucks A and B. b. Compare the final speeds of pucks A and B.
Please i need an answer to this question, "Trace the historical development of Ghana from 1957 till present day". Help me
The first nation south of the Sahara to achieve independence was Ghana, formerly the Gold Coast, on March 6, 1957.
What took place in Ghana in 1957?
On March 6, 1957, Kwame Nkrumah told the Ghanaian people that they were free and that "our beloved country, Ghana, is free forever." He also emphasized that "the African People are capable of administering their own affairs." Sub-Saharan Africa's first nation to attain independence from European colonial domination was Ghana.
Up until 1960, Ghana was a constitutional monarchy and parliamentary democracy. Following a national vote, Ghana was then proclaimed a republic. Following the Soviet example, the Second Development Plan (1959–1964) switched away from increasing state services and toward increasing productivity in the important sectors. In 1959–1964, expansion of secondary schools, as well as of vocational and higher education, became a top goal.
If Ghana was to play its leadership role in the liberation of Africa from colonial and neo-colonial rule, government spending on road building projects, mass education of adults and children, health services, and the construction of the Akosombo Dam were all crucial. Increases in the price and output of cocoa, gold, and oil during the past 30 years have contributed to Ghana's transformation: real GDP growth has quadrupled, extreme poverty has decreased by half, and in 2011, Ghana was upgraded to a lower middle-income country status.
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Two 0.90 g spheres are charged equally and placed 1.9 cm apart: When released they begin to accelerate at 130 m/s? Part A What is the magnitude of the charge on each sphere? Express your answer to two significant figures and include the appropriate units Value Units HA
The magnitude of the charge is 0.82 * 10-7 C, that can be calculated using the formula for the same.
Electric charge is available in types, which we pick to name high-quality charge and bad charge. This is the importance of the pressure which every fee exerts on the opposite fee (recollect Newton's third law).
Let the charge on each of them be "Q"
Now, electrostatic force of attraction on each of them = (1/4πε)(Q2/0.022)
Also, this force is being acted on each of the spheres, hence,
(1/4πε)(Q2/0.022) = M*a
9 * 109 * Q2 * 104 / 4 = 10-3 * 150
Q = 0.82 * 10-7 C
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Using the formula for the charge, it can be determined that the charge has a magnitude of 0.92 x [tex]10^{-7}[/tex] C.
There are many kinds of electric charge, which we will refer to as good charge and poor charge. This highlights the significance of the pressure one fee puts on the opposite fee remember Newton's third law.
Let "Q" be the charge on each of them.
Currently, the electrostatic force of attraction between each of them is equal to (1/4)(Q2/0.022).
Additionally, each of the spheres is being affected by this force, so
(1/4πε)(Q2/0.022) = M*a
9 x 109 x Q2 x 104 / 4 = [tex]10^{-3}[/tex] x130
Q = 0.92 x [tex]10^{-7}[/tex] C
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"_____is the process by which rocks break down in place to produce soils and sediments. group of answer choices:
a. weathering b. metamorphism c. lithification
d. subduction"
Weathering is the process by which rocks break down in place to produce soils and sediments.
The breakdown or dissolving of rocks and minerals on the earth's surface is known as weathering. Carrier of weathering include water, ice, acids, plants, animals and variations in temperature.
Erosion is the movement of soil, rock, or dissolved material from one region of the earth's crust to another, where it is deposited. Weathering, which is a static process, is distinct from erosion.
Rocks break down by the process called weathering. The effect of weathering and erosion cannot be resisted by any rock on Earth due to its softness.
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fill in the blank. when conducting an ero operation with a c-5 aircraft, vehicles and personnel exiting via the forward or aft ramp will proceed on a direct line with the fuselage at least___feet before turning, or at least____feet before stopping.
Vehicles and people leaving a C-5 aircraft via the forward or aft ramp must go at least 50 feet in front of the fuselage before turning or 100 feet before coming to a complete stop while executing an ERO operation.
ERO (emergency ramp offload) operations are carried out when the aircraft has to rapidly and safely dump goods and crew. Depending on the kind of aircraft, the location, and other variables, the particular standards and procedures for ERO operations may change. However, in general, it is important to make sure that any vehicles and people leaving the plane keep a safe distance from it and don't obstruct other activities. ERO activities target those who pose a threat to public safety, including gang members and noncitizens with criminal records, as well as those who have otherwise broken the country's immigration rules.
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Joan decided to go for a walk, st arting from her house. The diagram below shows the m easurement between places on t he route where he walks. what wil I be his Position when he is at c ar?*
(GIVING BRAINLIST TO THE CORRECT ANSWER)
Based on the information provided, his position when he is at a car will be -13 west.
What is the distance between Joan's house and the car?The distance can be found by adding smaller distances as shown below:
Distance from the house to the wheelbarrow: 11 meters
Distance from the wheelbarrow to the car: 2 meters
11 meters + 2 meters = 13 meters
This means the magnitude is 13 meters.
What is the direction?Based on the map, the direction is west, and considering this goes to the left this would be negative, making his position -13 west.
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Two charges +1x10-6 and -4x10-°C are separated by a distance of 2m. Determine the position of the null point.
A null point is a location in a field where the value of the field is 0 as a result of two or more opposite quantities entirely canceling one another.
Where is a null point located, and how can you find it?A null point is a location in a field where the value of the field is 0 as a result of two or more opposite quantities entirely canceling one another. The field of two positive point charges at point C in the figure is plainly seen to be canceling out and being equal to zero. C is a null point hence.
The null point, sometimes referred to as the null zone or region, is the location when the nystagmus eye movements abruptly calm down and vision becomes clearer. When looking straight ahead at anything or someone, a person with nystagmus may seem to tilt their focus to the right or left, up or down.
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The approximate shortest road miles distance from yosemite lodge to mirror lake is __ miles. (use your ruler or protractor to measure and calculate the approximate distance in miles. remember 1 inch equals 2,000 feet.)
a. 1 mile
b. 3 miles
c. 5 miles
d. 6 miles
The approximate shortest road miles distance from yosemite lodge to mirror lake is 3 miles.
What is meant by distance?
The midpoint between a celestial body's greatest and smallest separations from its primary.The metre is the SI unit for distance (m). Long distances can be measured in kilometres, whereas little distances can be gauged in millimetres (cm) (km).For instance, you might measure the distance in centimetres between the bottom and top of a piece of paper and the kilometres between your home and school.The International System of Units defines a metre as the distance unit. It's interesting to note that many other derived units or quantities, such as volume, area, acceleration, and speed, may be constructed using this as the basic unit and a few formulae.To learn more about distance refer to
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using the numbered direction arrows shown, indicate (by number) which direction arrow best represents the direction of the quantities listed below. if the quantity has zero magnitude or cannot be determined, indicate this with a 9 or 10, respectively.
The position vector at position D is shown by arrow 1, the change in position (displacement) between positions D and F is shown by arrow 2, and the average net force and change in velocity between positions D and F cannot be calculated.
Arrow 1 is a representation of the position vector for position D.
Arrow 2 illustrates the shift (position change) between positions D and F.
Arrow 3 illustrates the undeterminable velocity change between positions D and F.
Arrow 4 denotes the change in momentum from position D to position F. arrow 5 illustrates the indeterminable average net force between positions D and F. The vector's position is.
Arrow 6 displays position E.
Arrow 7 illustrates the positional shift between locations D and E.
Arrow 8 illustrates the difference in velocity between positions D and E.
Arrow 9 depicts the difference in momentum between positions D and E.
The indeterminable average net force between positions D and E is symbolized by arrow 10 and cannot be calculated.
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The question is -
Using the numbered direction arrows shown, indicate (by number) which direction arrow best represents the direction of the quantities listed below. If the quantity has zero magnitudes or cannot be determined, indicate using the corresponding number listed below. The position vector at location D _____ The change in position (the displacement) between location D and location F _____ The change in velocity between location D and location F _____ The change in momentum between location D and location F _____ The average net force between location D and location F _____ The position vector at location E _____ The change in position (the displacement) between location D and location E _____ The change in velocity between location D and location E _____ The change in momentum between location D and location E _____ The average net force between location D and location E.
four charges are placed on the vertices of a square and one at its center. using the symmetry of the arrangement, determine the direction of the force on the positive charge q in figure above, give that :
qa=qb= +7.50nC and qc=qd = -7.50nC
a. up
b. down
c. left
d. right
The direction of the direction of the force on the positive charge q will be towards left.
Lets assume that the Q is at the center of a coordinate graph, qa = qb = +7.50 nC are in third and second quadrant and qc = qd = -7.50 nC are in first and fourth quadrant. Then
F = k[-qQ(r₀-r₁)/(r₀-r₁)³ + qQ(r₀-r₂)/(r₀-r₂)³ + qQ(r₀-r₃)/(r₀-r₃)³ + -qQ(r₀-r₄)/(r₀-r₄)³]
According to the vectors
F = kqQ/r²[-(i+j) + (-i+j) + (-i-j) + -(i-j)]
F = kqQ/r²[-i -j + -i + j + -i -j + -i + j]
F = kqQ/r²[-4I]
I vector represent x-axis which is negative towards the left. As we can see that the resultant vector is in the direction of negative i-vector. As we assumed that the Q is at the center of the coordinate graph, so the direction of force will be left to the charge Q. Hence the correct option is C.
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A spring is stretched by 35 Cm and attached to a 500 g air-track glider, which is then released. The spring does 0.45 J of work on the glider as it returns to its equilibrium length. What is the value of the spring constant?
A 500 g air-track glider is fastened to a spring that has been 35 cm extended before being let off. In order for the glider to return to its equilibrium length, the spring must exert 0.45 J of force on it. 8 N/m is the spring constant.
Using the equation for the work a spring does, we can get the spring constant:
Work completed equals (1/2)*k*x2.
In this situation, the spring's displacement is 35 cm, and the work done is 0.45 J. K is the spring constant.
This allows us to determine k: k = (2 * work done) / x.
2 \s k = (2 * 0.45 J) / (35 cm)^2
Divide by 100 k to convert cm to m: (2 * 0.45 J) / (0.35 m).
2 \s k = 8 J/m^2
The spring constant is thus 8 N/m.
The spring stiffness is quantified by the spring constant, or k.
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Which of the following statements describes meta-analysis
Meta-analysis includes all of these such as systematic inclusion and exclusion criteria for studies, multiple, systematic searches to identify studies which answer a focused question, only quantitative studies are included in this. Thus, the correct option is B.
What is Meta-analysis?A meta-analysis is a statistical analysis which combines the results of multiple scientific studies. Meta-analyses of anything can be performed when there are multiple scientific studies available which are addressing the same question, with each of the individual study reporting measurements which are expected to have some degree of error in it.
The subjects from all the studies were pooled and statistically analyzed to determine the effect of the one thing such as relationship between wearing sunscreen and melanoma. This meta-analysis has been found to show a 50% reduction in the melanoma diagnosis among the sunscreen-wearers.
Therefore, the correct option is B.
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Your question is incomplete, most probably the complete question is:
Which of the following describe meta-analysis?
A. Systematic inclusion and exclusion criteria for studies
B. All of these
C. Multiple, systematic searches to identify studies that answer a focused question
D. Only quantitative studies are included
E. None of these
Name a structure that is on the ventral side of the heart, located more laterally within the axial region
The structure that is on the ventral side of the heart, located more laterally within the axial region is axillary lymph nodes.
What is axillary lymph nodes?The axillary lymph nodes are lymph nodes located in the human armpit. They drain lymph vessels from the lateral quadrants of the breast, superficial lymph vessels from the thin walls of the chest and abdomen above the level of the navel, and upper limb vessels.
They are classified into several groups based on their location in the armpit. These lymph nodes are clinically significant in breast cancer, and metastasis from the breast to the axillary lymph nodes is taken into account in disease staging.
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A tuning fork with a frequency of 512 Hz is struck at the same time as a guitar string. If 24 beats are heard in
6.0 s, find the possible frequency or frequencies of the guitar string.
The possible frequencies of the guitar string are 488 Hz and 536 Hz.
What are the possible frequencies of the guitar string?
The possible frequency or frequencies of the guitar string is calculated by applying beat frequency formula.
Fb = Ft - Fg or
Fb = Fg - Ft
where;
Fb is the beat frequencyFg is frequency of the guitarFt is the frequency of the tuning forkFg = Ft - Fb
Fg = 512 Hz - 24 Hz
Fg = 488 Hz
Fg = Fb + Ft
Fg = 24 Hz + 512 Hz
Fg = 536 Hz
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select all that apply from the following list, select the characteristics of all heat engines. (check all that apply.) multiple select question. reject heat to a low-temperature sink reject heat to a high-temperature sink receive heat from a high-temperature source receive heat from a low-temperature source
Receive heat from a high-temperature source and reject heat to a low-temperature sink are the characteristics of all heat engines.
What is High-temperature sources?High-temperature sources are materials that can produce and sustain high temperatures. These sources can range from small, localized heating elements to large, complex nuclear reactors. Common high-temperature sources include fossil fuels, such as wood, coal, and oil, as well as nuclear and solar energy. High-temperature sources are used in a variety of applications, including power generation, heating and cooling, and manufacturing processes.
Heat engines transfer heat from a high-temperature source to a low-temperature sink, so they cannot reject heat to a high-temperature sink or receive heat from a low-temperature source.
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for each set of questions below think about which quantities cant change when a parallel plate is isolated
What is the capacitance of the parallel plate:
The capacitance of the parallel plate cannot change when it is isolated because it is determined by the physical characteristics of the plate, such as its area, distance between plates, and permittivity of the material between them. These characteristics do not change when the plate is isolated.
Capacitance is a measure of the ability of a component or system to store electrical energy. It is the ratio of the electric charge on a conductor to the potential difference between its ends. The unit of capacitance is the Farad (F). Capacitors are components that are used to store electrical energy and are found in many electronic circuits. They consist of two conductive plates separated by an insulating material called a dielectric.
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3. calculate rab a. for the resistor network below (10 points) b. for the modified resistor network below (10 points)
To calculate electrical resistance for a resistor network first you have to check whether the resistors are in series or parallel connection and then apply the formula of resistance.
R= V/I where V is the potential difference across the conductor (in volts) and I is the current through the conductor (in amperes).
Electrical resistance is the property of an electrical conductor to oppose the flow of electric current. All materials have their own electrical resistance and is represented by R and its SI unit is ohm.
Resistance can be calculated using the Ohm's law. It is defined as the ratio of the applied voltage to the current.
To calculate the total resistance of a network in series connection,
Total resistance = R₁+ R₂+ R₃
To calculate the total resistance of a network in parallel connection,
Total resistance = 1/R₁+ 1/R₂+ 1/R₃
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What cause-and-effect relationships identified in the spring-loaded cart can be applied to the rocket sled?
Cause
Effect
1. Increase in thrust: The same cause-and-effect relationship applies to a rocket sled. When the thrust of the rocket sled is increased, it will cause an increase in the acceleration of the sled.
What is acceleration?Acceleration is the rate at which an object's speed or velocity changes over time. It is a vector quantity, meaning it has both magnitude and direction. Acceleration can be caused by a number of factors, including forces, changes in gravity, or changes in direction. Acceleration is the second derivative of velocity with respect to time, or the rate of change of the velocity vector.
This is because the increased thrust generates more force, which in turn causes the sled to accelerate faster.
2. Increase in weight: The same cause-and-effect relationship applies to a rocket sled. When the weight of the rocket sled is increased, it will cause a decrease in the acceleration of the sled. This is because the increased weight will require more force to accelerate the sled, thus resulting in a slower acceleration.
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Suppose you used a hot pot to convert a 150 g piece of ice that was initially at -15°C into liquid water at 50°C.
a. Represent this process in one complete energy-system diagram covering the entire interval. b. How much heat is added to complete this entire process?
c. if your hot pot has a power rating of 600 watts, show how to find how long it will take to complete the process. (make sure you are comfortable using standard units of energy, and that you understand the relation of power to energy. hint: what are watts?)
(a) The energy-system diagram is shown in the picture attached.
(b) The heat energy added is 86,295 Joule.
(c) It takes 144 seconds to complete the process.
We solve the problem with the formula for heat energy.
What is heat?Heat is the energy that is transferred from higher to lower temperature. The quantity of heat energy (also called thermal energy) can be calculated by
Q = mcΔT, when there is change in temperature.Q = mL, when there is no change in temperature.A 150 g piece of ice is converted from -15°C to 50°C in a hot pot. The power rate is 600 Watts.
a. Make the energy-system diagram!
b. Total heat energy added! (Q total)
c. Time to complete the process! (t)
The diagram picture is shown in the attachment. The piece of ice is heated from -15 degrees Celsius to zero by the energy of Q₁. When it reaches zero temperature, the ice is melted by the energy of Q₂. After all the solid ice melts, the liquid water continues to rise in temperature up to 50 degrees Celsius by the energy of Q₃.
The scientific data shows
Specific heat of ice, c_ice = 0.5 cal/g°C.Specific heat of water, c_water = 1 cal/g°C.Laten heat of fusion, L_fusion = 80 cal/g.1 calories = 4.184 JouleThe total heat energy absorbed is
Qt = Q₁ + Q₂ + Q₃
Qt = mcΔT (ice) + mL (melting) + mcΔT (water)
Qt = m(c_ice × ΔT + L_fusion + c_water × ΔT)
Qt = 150[0.5 × (0-(-15)) + 80 + 1 × (50-0)]
Qt = 150[7.5) + 80 + 50]
Qt = 150[137.5]
Qt = 20,625 calories
Convert the unit from calories to Joule!
Qt = 20,625 × 4.184 Joule
Qt = 86,295 Joule
The time taken to complete the entire process would be
P = Q/t
600 = 86,295/t
t = 86,295/600
t ≈ 144 seconds
Hence, the process in the diagram as shown in the picture attached has the total heat energy of 86,295 Joule. It will take 144 seconds to complete the process.
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when we placed the bottle in the cold water, what happened to the air inside the bottle? make sure density is included in your answer.
The air volume is lowered. The quantity of air remains constant, but its volume and pressure decrease as the temperature rises. There is no vacuum formed; the pressure within the container is just lower than the pressure outside.
What is pressure?Pressure is defined as the force applied perpendicular to an object's surface per unit area across which that force is dispersed. Gauge pressure is the pressure in relation to the surrounding atmosphere. Pressure is expressed using a variety of units. Pressure is the force exerted on a surface per unit area. When a force F is applied to area A, pressure P=F/A. Pressure is the force acting on a unit area of a surface. It works perpendicular to the surface under pressure. Pressure = force multiplied by the area on which it operates. The thrust (perpendicular force on a surface) acting per unit area of a body is described as pressure.
Here,
The air volume has been reduced. The volume and pressure of air drop as the temperature rises, but the amount of air remains constant. There is no vacuum created; the pressure within the container is just lower than the pressure outside.
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in the figure, a particle is to be released at rest at point a and then is to be accelerated directly through point b by an electric field. the potential difference between points a and b is 100 v. which point should be at higher electric potential if the particle is (a) an electron, (b) a proton, and (c) an alpha particle (a nucleus of two protons and two neutrons)? (d) rank the kinetic energies of the particles at point b, greatest first.
The point that should be at higher potential if the particle is an electron is B. The point that should be at higher potential if the particle is an electron is A.
What is meant by electron ?
A negatively charged subatomic particle known as an electron can either be free or attached to an atom (not bound).One of the three main types of particles inside an atom, along with protons and neutrons, is an electron that is linked to the atom. The nucleus of an atom is made up of electrons, protons, and neutrons together.The negatively charged particles known as electrons revolve around the outside of the nucleus. For scientists, it can be challenging to monitor them because of how quickly they spin. The tiniest particles in an atom, you can put 2000 of them into a proton, they are drawn to the positive charge of the protons.To learn more about electron refer to
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you observe that a negatively charged plastic pen repels a charged piece of magic tape. you then observe that the same piece of tape is repelled when brought near a small metal sphere. you are wearing rubber soled shoes, and you touch the metal sphere with your hand. after you touch the metal sphere, you observe that the tape is attracted to the metal sphere. which of the following statements could be true. list all that apply, sep
The correct statements are options given below:
(The complete question is attached below)
According to the statement there is a force of repulsion between the two objects. Remember that two objects must have the same charge so that they repel each other.In this way if the tape is repelled by a plastic pen that is negatively charged, this allows us to appreciate that the tape is also negatively charged. Now if the tape repels the sphere, therefore the sphere is also negatively charged.Under these considerations the correct answers would be
2. Sodium ions from the salt water on your hand moved onto the sphere
4. The excess negative charge from the sphere spread out all over your body
6. Electrons from the sphere moved into the salt water on your skin, where they reacted with sodium ions
7. After you touched it, the metal sphere was very nearly neutral.
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what is summer caused by
Summer is caused by the tilt of the Earth's axis. The Earth's axis is tilted at an angle of about 23.5 degrees relative to its orbit around the sun. As the Earth orbits the sun, different parts of the Earth receive more or less direct sunlight depending on the tilt of the axis. When the northern hemisphere is tilted towards the sun, it is summer in the northern hemisphere and winter in the southern hemisphere. This is the opposite when the northern hemisphere is tilted away from the sun, it is winter in the northern hemisphere and summer in the southern hemisphere.
Answer: Direct sunlight striking Earth
Explanation: I read it on a book of space. : D
A team in Quebec is playing ice baseball. A 72 kg player who is initially at rest catches a 145 g ball traveling at 18 m/s. If the player's skates are frictionless, how much time is required for him to glide 5 m after catching the ball?
The time required for the player to glide 5m after catching the ball would be 0.073 seconds.
What is conservation of momentum principle?
The conservation of momentum principle states that in an isolated system (one in which there are no external forces acting on it), the total momentum of the system will remain constant. This principle is based on the law of conservation of energy, which states that energy cannot be created or destroyed, only transferred or transformed.
To calculate the time required for the player to glide 5m after catching the ball, we need to use the conservation of momentum principle.
The initial momentum of the system (player + ball) is 0, since the player is at rest. After catching the ball, the final momentum of the system is (72 kg) (0 m/s) + (0.145 kg) (18 m/s) = 2.61 kg m/s.
To find the final velocity of the player, we can use the equation:
Final momentum = Initial momentum + Impulse
where Impulse = force x time
The force is equal to the change in momentum of the system divided by the time it takes for the change to occur.
So, Impulse = (2.61 kg m/s - 0) / t
Also, the impulse is equal to the mass of the player multiplied by the change in velocity of the player.
So, (72 kg) (change in velocity of the player) = (2.61 kg m/s - 0) / t
Now we can calculate the time it takes for the player to glide 5m.
change in velocity = final velocity - initial velocity = 5/t
(72 kg) (5/t) = 2.61 kg m/s
t = (2.61 kg m/s) / (72 kg × 5 m/t) = 0.073 seconds
So, the player will glide 5m after catching the ball in 0.073 seconds.
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which of the following resources would most likely be mined from the plant remains buried in eastern montana during the cretaceous?
The most likely resource to be mined from the plant remains buried in eastern Montana during the Cretaceous would be fossil fuels.
What is Montana?Montana is a state in the western region of the United States. It is bordered by North Dakota to the east, South Dakota and Wyoming to the south, Idaho to the west, and the Canadian provinces of British Columbia, Alberta, and Saskatchewan to the north.
Fossil fuels are formed from the remains of plants and animals which have been buried and subjected to high temperatures and pressures over millions of years. The remains of plants buried in eastern Montana during the Cretaceous period would have been subjected to these conditions and thus may contain deposits of fossil fuels such as oil and natural gas.
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When jumping, a flea rapidly extends its legs, reaching a takeoff speed of 1.0 m/s
over a distance of 0.50 mm
.
The maximum height reached by the flea is 1.23 m.
What is time of motion of the flea?
The time of motion of the flea is calculated by applying the following formula.
t = d / v
where;
d is the horizontal distance reached by the fleav is the horizontal speedt = ( 0.5 m ) / ( 1 m/s )
t = 0.5 s
The maximum height reached by the flea is calculated as follows;
h = ¹/₂gt²
where;
g is acceleration due to gravityt is the time of motion of the fleah = ¹/₂ x 9.8 x ( 0.5 )²
h = 1.23 m
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The complete question is below:
When jumping, a flea rapidly extends its legs, reaching a takeoff speed of 1.0 m/s over a distance of 0.50 m, what is the maximum height reached by the flea?
use the time dependent schrodinger equation and the turnover rule to prove that where h is the hamiltonian operator
the Hamiltonian operator A quantum system's total energy is described by the operator h, and its temporal development is periodic.
The wave function of a quantum system, represented by the wave function psi, is said to change over time in accordance with the Hamiltonian operator, represented by H, according to the time-dependent Schrödinger equation (TDSE). The equation i/t = H provides the TDSE.
According to the turnover rule, a quantum system's time-evolution has a periodic nature, with a period equal to the reciprocal of the difference in energy eigenvalues between its beginning and final states. The following equation provides the turnover rule:
T = 2π/|Ef - Ei|
By replacing the TDSE into the turnover rule and simplifying, we can demonstrate using the TDSE and the turnover rule that where h is the Hamiltonian operator.
T= 2π/|Hf - Hi|
I / t = H I / t (f / t - I / t) = H f f - Hi I / t (e f - ei) = H f f - Hi
T= 2π/|Hf - Hi|
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