Answer: I think it is C.
Explanation: In an inelastic collision, the object hits the item and stays with it. Therefore, both momentum and kinetic energy need to be presen.t
A body is uniformly accelerated from rest to a final velocity of 100m/s in 10 seconds.Calculate the distance covered
Answer:
Solution s =ut + ½ at 2 = 0×10 + ½ × 10×10 2 = 1000/2=500 m
Explanation:
The body is accelerating from stationary to a velocity of 100 m/s within 10 seconds. Thus, the distance covered is 500 m.
What is acceleration?Acceleration of a moving body is the rate of change in its velocity. Acceleration is a vector quantity having both magnitude and direction. The change in magnitude or direction or both in velocity causes an acceleration in the moving body.
The relation between distance with the velocity, acceleration and time is given as :
s = ut + 1/2 at²
The initial velocity u = 0 here
v = 100 m/s
t = 10 seconds.
acceleration = 100 /10 = 10 m/s²
Then the distance covered is calculated as follows:
s = 1/2 at²
= 1/2 10 m/s²× 10²
= 500 m
Therefore, the distance covered by the body is 500 m.
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If a rock on a cliff starts with 3,000 J of GPE and 0 J of KE and ends with 0 J of GPE and 5,000 J of KE, what law of physics would this violate?
The law of physics that this scenario would violate is the law of conservation of energy.
What is the law of conservation of energy?The law of conservation of energy states that energy possessed by an object or physical body can neither be created nor destroyed but can only be transformed from one form to another.
This ultimately implies that, the energy possessed by the rock at the beginning must be equal to the energy possessed by the rock at the end in accordance with the law of conservation of energy.
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2. Following a strength training plan, someone who increases lean muscle mass by .5 pounds per month will achieve a weight gain of ______
a) 5 pounds in two months.
b) pound in one month.
c) 2 pounds in four months
Answer:
C
Explanation:
.5 lb/month * 4 month = 2 lbs
Hello people ~
When a comb rubbed with dry hair attracts pieces of paper. This is because the______
(a) comb polarizes the piece of paper
(b)comb induces a net dipole moment opposite to the direction of field
(c)electric field due to the comb is uniform
(d) comb induces a net dipole moment perpendicular to the direction of field
[tex]\bold{Heya!}[/tex]
Answer :-(b) comb induces a net dipole moment opposite to the direction of field.
Explanation :-When a comb rubbed with dry hair it's attracts pieces of piece of paper. This is because the comb that induces of the dipole net that of the moment thatopposite of the field. And, This happens the field dueing to charge of the comb induces of the dipole moment in the paper of the molecules in the dielectric.
Hopefully This Helps ! ~
#LearnWithBrainly
[tex]\underline{Answer :}[/tex]
Jaceysan ~
Answer:
Option B
Explanation:
When a comb is rubbed with dry hair it induces some charge or its get charged either positive or negative
As paper remains in neutral hence it attracts the paper
Hence option B is correct
Explain Atmospheric Pressure and Wind
1) potential energy+kinetic energy is equal to
A. Gravitational potential energy
B. Thermal energy
C. Chemical energy
D. Mechanical emergy
2) …….. is the study of the composition & properties of matter
A. Ecology
B. Biology
C. Chemistry
D. Model
E. Atoms
3) building blocks of matter are called…
A. Mass
B. RNA
C. Neutrons
D. Atoms
E. Protons
4)the force you apply to a machine is the..
A. Efficiency
B. Input force
C. Output force
D. Resistance
5) friction within machinery increases efficiency
A. True
B. False
Please help<3
Explanation:
1) D.
the other answer options don't make any sense in that regard. these 2 forms of energy represent in total mechanical energy.
2) C. Chemistry
3) D. Atoms.
although, protons and neutrons are part of them.
4) B. Input force
5) B. False
friction causes energy to be diverted to doing unwanted and unnecessary things, like creating heat instead of movement.
Name all the energy transfers that occur to make a solar-powered traffic light work (name what generates the energy, and what kind of energy it turns to):
someone give me excuses for not having your pe kit
How long does it take for a spaceship to get to the moon.
Answer:
about 3 days
It takes about 3 days for a spacecraft to reach the Moon. During that time a spacecraft travels at least 240,000 miles (386,400 kilometers) which is the distance between Earth and the Moon. The specific distance depends on the specific path chosen.
Explanation:
no explanation
How many Watts of power does a model rocket engine have if it does 66 J of work on a model rocket in 0.9 seconds?
Power developed by a model rocket engine will be 73.3 watts. Power is the ratio of the work done or the enrgy to the time period.
What is the power output?The rate of the work done is called the power output. It is denoted by P.Its unit of a watt.
The given data in the problem is;
E is the energy = 66 J
P is the power output =?
t is the time period = 0.9 sec
The power output is given as;
[tex]\rm P = \frac{E}{t} \\\\ \rm P = \frac{66}{0.9} \\\\ \rm P = 73.3 \ watt[/tex]
Hence power developed by a model rocket engine will be 73.3 watts.
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Plants cause weathering, too. a seed that falls into a crack in a rock may grow there. growing roots may push on and enlarge the crack, what is this process called question 3 options: chemical weathering mechanical weathering root-pry pedalfer
The process which involves plants to cause weathering to a seed that falls into a crack in a rock therefore, breaking apart the rock is called Mechanical weathering.
Mechanical weatheringThis is defined as the set of weathering processes that break apart rocks into particles (sediment) through physical processes. The most common form of mechanical weathering is the freeze-thaw cycle. Water seeps into holes and cracks in rocks then the water freezes and expands, therefore making the holes larger eventually making the rock split apart.
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Answer:
root-pry
Explanation:
i took the test
What is the volume of the composite figure? 140 cubic inches 147 cubic inches 168 cubic inches 196 cubic inches.
The composite figure is a combination of a rectangular pyramid and a rectangular prism, hence its volume is 140in³.
Rectangular Prism and PyramidA rectangular prism is simply a three dimensional solid shape with six faces that are rectangles.
Volume of a rectangular prism is expressed as;
V = w × h × l
Where l is length, h is height and w is width
A rectangular pyramid is simply a three-dimentional object with a rectangular shaped base and triangular shaped faces that correspond to each side of the base.
The volume of rectangular pyramid is expressed as;
V = (1/3) × l × w × h
Where l is the base length, w is the base width and h is the height of the pyramid.
From the diagram below;
Length of rectangular prism Lprism = 7inWidth of rectangular prism Wprism = 3inHeight of rectangular prism Hprism = 4inLength of rectangular pyramid Lpyramid = 7inWidth of rectangular pyramid Wpyramid = 3inHeight of rectangular pyramid Hpyramid = 12in - 4in = 8inFirst we calculate the volume of a rectangular prism.
V = w × h × l
V = 3in × 4in × 7in
V = 84in³
Hence, the volume of the rectangular prism is 84in³.
Next, we calculate the volume of rectangular pyramid.
V = (1/3) × l × w × h
V = (1/3) × 7in × 3in × 8in
V = (1/3) × 168in³
V = 56in³
Hence, the volume of the rectangular pyramid is 56in³.
Volume of the composite figure = Volume of prism + Volume of pyramid
Volume of the composite figure = 84in³ + 56in³
Volume of the composite figure = 140in³
Therefore, the composite figure is a combination of a rectangular pyramid and rectangular prism, hence its volume is 140in³.
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Suppose that you want to heat a gas so that its temperature will be as high as possible. Would you heat it under conditions of constant pressure or constant volume
According to Gay - Lussac's law, you should heat it under conditions of constant volume.
Ideal GasAn ideal gas obeys the equation of state PV = nRT at all pressures, volume and temperatute.
According to Boyle's law, the volume of a gas is inversely proportional to the pressure while temperature is constant.
Also, according to Gay - Lussac's law, increase in temperature is direclty proportional to increase in pressure while volume remains constant.
Suppose that you want to heat a gas so that its temperature will be as high as possible. According to Gay - Lussac's law, you should heat it under conditions of constant volume.
Therefore, to heat a gas so that its temperature will be as high as possible, you should heat it under conditions of constant volume.
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How long would it take a machine to do 5000 joules of work if the power rating of the machine is 100 watts?
A. 0.2 s
B. 10 s
C. 50 s
D. 5 000 s
Answer:
hope this he;ps
Explanation:
power = work ÷ time
time = work ÷ power
time = 5,000 J ÷ 100 W
time = 50 s
4. Find the number of electrons transferred between two points kept at a potential difference of 20 V if 40 J of work is done
Required answer :-
Number of electrons transferred are 1.25 × 10^19Given :-
V = 20 Volt W = 40 JWe know that,
↠ W = P × t
↠ W = V × I × t
↠ W = V × Q/t × t
↠ W = V × Q
On substituting values, we get
↠ 40 = 20 × Q
↠ Q = 40/20
↠ Q = 2 c
↠ ne = q
↠ n = q/e
↠ n = 2/ 1.6 × 10^- 19
↠ n = 1.25 × 10^19
Hence,
Number of electrons transferred are 1.25 × 10^19define physical balance
A physical balance is simply a weight measuring instrument. It is used to measure the weight of any unknown object with the help of the other object with known weight.
Explanation:
Hope it helps you!!What objects have orbital paths? A. the sun and stars
B. meteors and asteroids C. the planets and moons
Answer:
The planets and moons.
Explanation:
Planets follow an elliptical path around the sun (kinda oval shaped). Moons do the same to planets.
Most newer homes are built with a circuit breaker that can
handle a maximum of 200 A of current. If a home is using
the maximum amount of current possible, which is flowing
every 2 seconds, how many coulombs of charge are flowing
into the house? Explain.
The coulombs of charge which are flowing into the house is 400 coulombs.
What is Electric charge?This is the physical property of matter that causes it to experience a force when placed in an electromagnetic field and its unit is Coulomb.
Electric charge(Q) = It where I is current and t is time
Q = It
= 200A × 2s
= 400 coulombs
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Question #14:
An engine using 1 mol of an ideal gas initially at 18.5 L and 402 K performs a cycle
consisting of four steps:
1) an isothermal expansion at 402 K from 18.5 L to 41.2 L
2) cooling at constant volume to 273 K
3) an isothermal compression to its original volume of 18.5 L
4) heating at constant volume to its original temperature of 402 K
Find its efficiency. Assume that the heat capacity is 21 J/K and the universal gas constant is 0.08206 L · atm/mol/K = 8.314 J/mol/K.
The efficiency of the engine through the four steps cycle is 83.4%.
What is the efficiency of a machine?The efficiency of a machine is the ratio of useful work done by the machine and the work done on the machine expressed as a percentage.
The efficiency of the engine is given by:
[tex]ɛ=\frac {W} {Q}[/tex]
where;
W is the work done in the four steps,Q is the energy inputSince there at four steps in a cycle:
[tex]ɛ=\frac {W_1+ W_2+W_3+W_4} {Q_1+Q_2+Q_3+Q_4}[/tex]
The work done in the first step (isothermal expansion) is given by:
[tex]W_1=nRT_1\ln{\frac {V_2} { V_1}}[/tex]
where:
n= 1 mole, T1 = 402 K, V2 = 41.2 L, V1 = 18.5 L
Substituting the values:
[tex]W_1 = 1 × 8.314 × 402 \times ln{\frac {41.2} {18.5}} = 2676.01 J \\ [/tex]
Steps 2 and 4 are constant volume processes, therefore;
[tex]W_2=W_4=0[/tex]
The work done in the third step (isothermal expansion) is given by:
[tex]W_3=nRT_3\ln{\frac {V_4} { V_3}} [/tex]
where;
n = 1 mol, T3 = 273 K, V4 = 41.2 L, V3 = 18.5 L
Substituting the values:
[tex]W_3 = 1 × 8.314 × 273 \times ln{\frac {41.2} {18.5}} = 1817.29 J \\ [/tex]
[tex]W_3 = 1 × 8.314 × 273 \times ln{\frac {41.2} {18.5}} = 1817.29 J \\ [/tex]Heat enters the system only during steps (1) and (4).
The internal energy of the gas increases in step 4 but no work is done, while the internal energy is constant change in step 1 but work is done by the gas.
Thus;
[tex]Q_2=Q_3=0[/tex]
The heat that enters the system during the isothermal expansion is given by:
[tex]Q_1=W_1[/tex]
The heat that enters the system on step 4 at constant volume is given by:
[tex]Q_4=C_V(T_4-T_3)[/tex]
where:
Cv =21 J/K, T3 = 273 K, T4 = 402 K
Substituting the values:
[tex]Q_4= 21 × (402 - 273) = 2709 \: J[/tex]
Solving for efficiency, ɛ:
[tex]ɛ=\frac {2676.01+ 0+0+1817.29} {2676.01+0+0+2709} = 83.4\%[/tex]
Therefore, the efficiency of the engine is 83.4%.
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Question 7 of 10
Which of the following phrases best describes the term scientific model?
A. A simplified representation used to explain or make predictions
about something
B. The application of scientific knowledge to make predictions about
an object, system, or process
C. A physical copy of a scientific object, system, or process
Answer:
my answer to that question was c
Explanation:
If one knew the luminosity of a star and measured its apparent brightness, which expression would one use to calculate the distance to the star
The expression which one would use to calculate the distance to the star is distance = sq. root. of (luminosity/4pi*apparent brightness)
What is Distance?
This is a scalar quantity and refers to how much ground a body has covered.
In a situation where parameters such as luminosity of a star and measured its apparent brightness are known then the distance to the star will be:
Distance= √(luminosity/4pi*apparent brightness)
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What does the quote means? And do you agree or disagree and if you could change it what would you say?
what does Constant / Controlled Variable mean in science
Answer:
variable that doesnt change
Explanation:
contolled variable is that variable that does not change throughout the course of the experiment
Someone please help me, I know I already asked a question please don't think I not smart, but
#1. How are potential and kinetic energy related?
#2. How are sounds made?
Answer:
PE is related to the ability to do work, If an item is sitting on a shelf
it has potential energy relative to its position on the floor, However, if the object were to fall it would hit the floor with a KE equal to the PE that it had sitting on the shelf.
Sounds are caused by compressional waves in the air - when a piano key is struck or a TV is turned on, then compressional waves are produced in the surrounding air due to a disturbance. The human ear recognizes the disturbed air as due to the object that created the disturbance.
Which force is responsible for holding the nucleus together via gluons.
How to prepare for physics ATP exam o'levels?
Spend time on this subject. Physics may have some concepts which are difficult for students to understand in some cases. A key example is electricity and magnetism. Spend extra time on topics you find difficult and most of all, remember to do PAST PAPERS. These will be your light in the dark, your teachers, your friends. Continue to do them, and remember to leave one unsolved before your examinations. This will orient your mind for the examination and let you achieve the maximum marks possible.
i would appreciate your help
Answer:
22. C. Pz > Py > Px
23. B. 5.0 × 10⁴Pa
24. B. Upward thrust exerted by the liquid
25. B. The volume of the object immersed in the liquid decreases
26. D. When a body is wholly or partially immersed it experiences upthrust equal to the weight of the fluid displaced
Explanation:
22. The more you go deeper into the sea, the more the pressure of the water increases pushing down on you.
The reason why salt water is very dense is that when the salt dissolves in the water, it adds to the mass of the water, which makes the water more denser.
Due to this, we can assume that the water pressure exerted on the fish will be greater beneath the sea than the lake at the same depth.
Answer: C. Pz > Py > Px
----------------------------------------------------------------------------------------------------------
23.
Given:
Density of water = 1000 kg m⁻³
Atmospheric pressure at sea level, Patm = 1.0 × 10⁵ Pa]
Depth of water in sea = 5m
To find the pressure exerted by the water on the fish, we use the formula: P = hpg
P = pressure
h = height or depth of water
p = density of water
g = gravitational field strength
We are given the depth and density, but not the gravitational field strength
Gravitational Field Strength: Measures how much gravity there is
And since we live on earth, the gravitational field strength is 10 N/kg
Depth, h = 5m
Density, ρ = 1000 kg/m³
Gravitational Field Strength, g = 10 N/kg
Now we substitute these into the formula:
P = hpg
P = (5)(1000)(10)
Multiply 5 and 1000 to get 5000
P = 5000 × 10
Multiply 5000 and 10 to get 50000
P = 50000Pa
↓
P = 5.0 × 10⁴Pa
Answer: B. 5.0 × 10⁴Pa
----------------------------------------------------------------------------------------------------------
24. When a body is fully or partly immersed in a liquid, it undergoes an apparent loss in its weight due to upward thrust exerted by the liquid.
The upward thrust is the same as the weight of the fluid being displaced by an object.
Answer: B. Upward thrust exerted by the liquid
----------------------------------------------------------------------------------------------------------
25.
When you add common salt to water it becomes denser, which can increase the mass and volume of the water. Due to water becoming denser, it can make an object thats less dense float. Also, density and volume are inversely proportional to each other, meaning that when density increases, volume decreases.
Answer: B. The volume of the object immersed in the liquid decreases.
----------------------------------------------------------------------------------------------------------
26.
Achimede's principle states that:
Answer: D. When a body is wholly or partially immersed it experiences upthrust equal to the weight of the fluid displaced.
what does the expression of the power consumed by an electric appliances by a DC current? What is this unit of this power in SI?
Explanation:
dc stands for direct current it won't hurt u if u get in contact with dc but ac will be threatening to life
si unit is same as in ac (alternate current) and it is ampere or amp
what unit of the energy does a power company charge a consumer for
Visible light has a range of wavelengths from about 400-750 nm. Which of these wavelengths is
most likely seen as the color red?
Answer:
600-750
Explanation:
The red color in the visible region lies in the wavelength of 600 – 750 nm. The visible light spectrum is the fraction of the spectrum that is visible to humans.
What is wavelength ?The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.
The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.
The length of a wave is measured in its propagation direction. The wavelength is measured in meters, centimeters, nanometers, and other units since it is a distance measurement.
The portion of the spectrum visible to the human light is known as the visible light Spectrum.
Visible light has a range of wavelengths from about 400-750 nm. The red color in the visible region lies in the wavelength of 600 – 750 nm.
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Barton conducts an experiment using three metallic bars that might be magnets. the bars are labeled a, b, and c. the ends of each bar are numbered 1 or 2. 3 rectangles aligned horizontally end to end. the first has 1 a 2 on it. the second has 1 b 2 on it. the third has 1 c 2 on it. he places the end of one bar close to an end of a second bar and records his results in the table shown. a 3 column table with 3 rows. the first column is labeled end with entries a 1, a 2, b 2. the second column is labeled end with entries b 1, c 1, a 1. the last column is labeled result with entries attract, repel, attract. based on the data, which prediction should he expect to occur? a2 repels b1. c2 attracts b2. b1 repels c1. a1 attracts c2.
The prediction should the expect to occur will be C₂ attracts B₂. This is due to the fact that like charges repel while the unlike charges attract each other.
What is a magnet?A magnet is an iron piece or of other material with its constituent atoms arranged in such a way that it shows magnetism qualities,
Like charge attracting different iron-containing objects or engaging itself in a magnetic field.
The given metallic bars are A, B, and C. Every end of the magnet is denoted with the 1 and 2.
The denotation to the magnet is given as;
A₁A₂
B₁B₂
C₁C₂
He places the end of one bar close to an end of a second bar. The end of magnets C₂ and B₂ are of unlike charges. As we know that the unlike charges attract each other.
So that the C₂ and B₂ due to the unlike charge ends attract each other.
Hence the prediction should the expected to occur will be C₂ attracts B₂
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Answer:
b
Explanation:
so you dont have to read the long one