Answer:
If you meant the Periodic Table it's the alkaline-earth metal
beryllium (Be)
magnesium (Mg)
calcium (Ca)
strontium (Sr)
barium (Ba)
radium (Ra)
Explanation:
Which magnet would be best for lifting heavy metal, moving it,and letting go of it
Hello people ~
On charging by conduction, mass of a
body may
(a) increase
(b) decreases
(c) increase or decrease
(d) None of these
increase or decrease
body gains mass when gets negative charge/electronsbody losses mass when gets positive charge/losses electrons
Thus the mass may increase and decrease due to conduction || varies
The photograph shows a kettle made of the element copper. Which statement describes a chemical property of copper?
A. Copper forms a patina when it interacts with air.
B. Copper is a solid at room temperature.
C. Copper is a good conductor of electric current.
D. Copper can be re-shaped when hit with a hammer.
Ers), and
1. A paintball with a mass of 0. 15 kg is fired from a paintball gun that has a mass of 5. 5 kg. The paintball leaves the
gun with a velocity of 45 m/s [N] having accelerated for only 0. 10 s. Calculate the acceleration and the final
velocity of the paintball gun.
Please help
Answer:
-13.5 m/s^2
-1.35m/s
Explanation
First, find the momentum of the paintball by using the formula [tex]p=mv[/tex].
[tex]p=0.15*45[/tex]
[tex]p = 6.75[/tex]
The next step would be to find the change of momentum of the gun. Since the gun was at rest it had a momentum of 0. Momentum acts in different directions equally, therefore we can set up the equation for the acceleration:
FΔt=Δp
Where F is force, Δt is the change of time and Δp is the change of momentum.
Since we solve for acceleration, we can convert F to ma to get:
maΔt=Δp
Substitute values:
5a*(0.1-0)=-6.75
5a=-67.5
a=-13.5
Our a is -13.5m/s^2, it's negative since the direction it's acting on is opposite of the paintball.
Now we can find velocity (and double-check our work!).
The first way to solve for velocity is:
[tex]V=Vi+at[/tex]
Where V is final velocity, Vi is initial, a is acceleration and t is time.
substitute values:
[tex]V=0-13.5*0.1\\V=-1.35m/s[/tex]
If we are correct, using the formula p=mv, we should get the same result (remember, our momentum is negative).
[tex]p=mv\\-6.75=5v\\-1.35m/s=v[/tex]
Hope this helps!
(b) When the taps are opened, water flows in the pipe for some time. The diagram shows the final water level in container (i) Complete the diagram to show the final water level in container B.
(ii) Explain why the water starts to flow and then stops.
ii) The pressure difference in the two containers starts the flow of the water from container A to B until the pressure becomes equal in both the containers. Pressure causes force on water, because pressure = force/area
Determino la masa en gramos y kilogramos de 1500 cm3 de alcohol etílico, cuya densidad es aproximadamente 790.0 Kg/m3. Tomar en cuenta que: Densidad (ρ) = masa (m)/volumen(v).
Para calcular el contenido en gramos de una bebida alcohólica basta con multiplicar los grados de la misma por la densidad del alcohol (0,8). El contenido de alcohol de una bebida depende de la concentración de alcohol y del volumen contenido.
The mass in grams and in kilograms of ethyl alcohol respectively is: a) 1185.0 g and b) 1185 kg
What is density?Density is an intensive property of matter. It represents the relationship between the mass and the volume of a body or substance. Its units are in the International System kg/m3, kg/L, g/ml, g/cm3, among others.
The density formula is:Density = m/V
The mass is obtained by clearing this equation
m=Density *Volume
datam= ?
V= 1500 cm3 * 1 * 10⁻⁶ m³ / 1 cm³ = 0.0015 m³ = 1.5 * 10⁻³ m₃
Density= 790.0 kg/m3
m = 790.0 kg/m³ * 1.5 * 10⁻³m³ = 1.185 Kgm = 1.185 kg * 1000 g/ 1 kg = 1185,0 gm= 1185,0 gSee more about this at:https://brainly.com/question/23704878What kind of particles exert electric force?
6. Aste owing questions 1. Answer question i and ii based on the information given below. In biology laboratory, Tashi observed a cell under a microscope. While on the cell, his attention was drawn to a tiny star like close to a large dense spherical body at the centre. He also observer many rod shaped structures scattered inside the cell. (i) Identify the cell organelles observed by Tashi. body a (ii) Is it a plant cell or an animal cell? 3. Study the diagram of a cell in Figure 1.8 and answer the following questions. i. In which group of organisms would you find this cell? Give reasons to support your answer. ii. Name the parts labelled A, B, C, and D. B TO D
The cell is an animal cell and the rod-shaped structures in the cell are mitochondria.
What are cell organelles?Cell organelles are membrane-bound structures found within the cell of eukaryotes which carry out specific functions in the cell.
Some cell organelles include:
mitochondria ribosomes Golgi bodies endoplasmoc reticulumThe rod-shaped structures in the cell are mitochondria.
Asters are star-shaped structures found within the cell which are found close to the nucleus d
at the early mitosis in an animal cell.
Asters do not form during mitosis in plants.
Therefore, the cell is an animal cell and the rod-shaped structures in the cell are mitochondria.
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1. ….. has no definite shape or size
A. Solid
B. Liquid
C. Gas
D. Plasma
2. Distance traveled per unit of time is..
A. Velocity
B. Speed
C. Motion
D. Acceleration
3. The SI unit of pressure is the..
A. Pascal
B. Atmosphere
C. Torr
D. Bar
( please help me)
Answer:
See below ↓↓↓
Explanation:
1. C. Gas
Gases are classified as a state of matter which has no definite shape or sizeLiquids are commonly confused with gases in this manner, but remember liquids take the definite shape of the container if poured in, gases are not so2. B. Speed
As the term "distance" is given, it is definitely speedOn the other hand, if "displacement" was given, then it would be velocity3. A. Pascal
All of the options are units of pressureBut, the SI unit is actually N/m², which otherwise commonly called PascalIf you see fog, what can you know about the temperature and dewpoint near the ground? (Just a simple-ish, short answer please.)
Answer:The difference between air temperature and dew point is less than 4.5 degrees Fahrenheit when fog can form.
Explanation:This can occur because of added moisture or falling air temperatures. The difference between air temperature and dew point is less than 4.5 degrees Fahrenheit when fog forms.
If two objects collide and stick together, what must increase?
A. the acceleration due to gravity
B. the friction between the two objects
C. the force of gravity between the objects
D. the two objects' momentum
Help pls.
The voltage in american household is 120 v. however, because we use a/c power, the voltage is oscillating between two maximums. what is the maximum or peak voltage required to produce an average voltage of 120 v?.
Answer:
188 v
Explanation:
The average of a sine wave is .637 times the peak value
.637 x = 120
x = 120 / .637 = 188 v
The voltage in an American household is 120 v. however because we use a/c power, the voltage is oscillating between two maximums, then the maximum or peak voltage required to produce an average voltage of 120 Volts would be 76.44 Volts.
What is power?The rate of doing work is known as power. The Si unit of power is the watt.
Power = work / time
The mathematical expression for the power is as follows
P = VI
As given in the problem, the voltage in American household is 120 v. however, because we use a/c power, the voltage is oscillating between two maximums.
The average voltage (VAV) of a sinusoidal waveform is determined by multiplying the peak voltage value by the constant 0.637, which is two divided by pi (π).
The maximum voltage = 120 × 0.637
= 76.44 Volts
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You serve a volleyball with a mass of 2.1kg the ball leaves your hand with a speed of 30 m/s. What is the kinetic energy of the ball?
Answer:
945 joules
Explanation:
the formula for kenetic energy is:
0.5 × m × v^2
where m is in (kg) ane (v) is in meter per second.
so we can just use the formula;
0.5 × 2.1 × 30^2
so the answer is 945 joules
The headlights of a typical car are powered by a 12 v battery. What is the resistance of the headlights if they draw 3.0 A if a current when turned on
Answer:
4 ohms
Explanation:
V = I R
12 = 3 R
R = 4 ohms
A transformer has 1,000 turns of wire in the primary coil and 50 turns in the secondary coil. If the input voltage is 2,400 V, what is the output voltage? - this is for my physical science class
the output voltage of the transformer that has 1,000 turns of wire in the primary coil and 50 turns in the secondary coil is 120 V
What is a transformer?A transformer is an electrical device that transfer electric energy from one circuit to another.
To calculate the output voltage of the transformer, we use the formula below.
Formula:
V/V' = N/N'........... Equation 1Where:
V = Primary/input VoltageV' = Secondary/output voltageN = Primary turnsN' = Secondary turnsMake V' the subject of the equation
V' = VN'/N........... Equation 2From the question,
Given:
V = 2400 VN' = 50 turnsN = 1000 turns.Substitute these values into equation 2
V' = (2400×50)/1000V' = 120 VHence, the output voltage of the transformer that has 1,000 turns of wire in the primary coil and 50 turns in the secondary coil is 120 V.
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A hiker climbs a hill 300m high. If she has a mass of 51kg, calculate the work she does in lifting her body to the top of the hill
Answer:
153000J
Explanation:
[tex]work \: done = \: force \times distance \\ force = mass \times acceleration \: due \: to \: gravity \\ = 51 \times 10 \\ = 510newton \\ work \: done = 510 \times 300 \\ = 153000joules[/tex]
If we say that a galaxy has a lookback time of 1 billion years, we mean that _________.
If we say that a galaxy has a lookback time of 1 billion years, we mean that its light traveled through space for 1 billion years to reach us.
have a great day!
When working with a conservative force, it is generally easier to work with a potential energy function, which is a scalar, than to compute the work along some path from the forces and displacements, which are vectors. the change in the potential energy of an object depends only upon its initial and final position, but it is independent of the path undertaken to move between those positions. some effort is initially required to obtain the potential energy function. consider a block of mass m attached to the end of a horizontal hooke's law spring with spring constant k. the block is free to move along a frictionless horizontal surface, and displacements are measured from the equilibrium position of the spring, taken here as the origin of the coordinate system.
a = fs = - k x iì‚
b = ds = dx iì‚
c = dw = - k x dx
d = dus = k x dx
required:
a. a finite change in the potential energy may be obtained by integrating infinitesimal changes. what integral expressions is correct for this hooke's law spring?
b. perform the integrations, and input an expression for the change in the potential energy of the spring, also known as the elastic potential energy.
a. The integral expression for the change in potential energy of the spring is ΔU = ∫kxdx
b. The change in potential energy of the spring is ΔU = k(x₂² - x₁²)/2
Since we are given the differential elastic potential energy, du, to find the integral expression, we integrate du.
a. The integral expression for the change in potential energy of the springThe integral expression for the change in potential energy of the spring is ΔU = ∫kxdx
Since the infinitesimal elastic potential energy of the spring du = kxdx, integrating both sides of the expression, we have
ΔU = ∫du
ΔU = ∫kxdx
So, the integral expression for the change in potential energy of the spring is ΔU = ∫kxdx
b. The elastic potential energy of the springThe change in potential energy of the spring is ΔU = k(x₂² - x₁²)/2
Performing the integration for the change in potential energy of the spring
ΔU, we have that integrating for change in length from x₁ to x₂
ΔU = ∫kxdx
ΔU = k[x²/2]₁²
ΔU = kx₂²/2 - kx₁²/2
ΔU = k(x₂² - x₁²)/2
So, the change in potential energy of the spring is ΔU = k(x₂² - x₁²)/2
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Which is an example of current electricity
Answer:
A or B you choose
Explanation:
This is called current electricity or an electric current. A lightning bolt is one example of an electric current, although it does not last very long. Electric currents are also involved in powering all the electrical appliances that you use, from washing machines to flashlights and from telephones to MP3 players.
what is an electrical current, amp, ampere Current is the flow of electrons. When a circuit is closed then a current of electrons can flow and when a circuit is open then no current can flow. We can measure the flow of electrons just like you can measure the flow of water through a pipe.
High energetic winds turning generator , causing electrons to flow into power lines is an example of current electricity. Remaining all are examples of static electricity .
What is current electricity ?The movement of electrons from one area of the circuit to another is referred to as current electricity. Free electrons flow between two points when two bodies with different potentials are connected by a wire, until both objects reach the same potential, at which point the current stops.
Current flows until a potential difference exists throughout the conductor. The following techniques can be used to produce current electricity:
1. Through the passage of a metal wire through a magnetic field (Both alternating current and direct current can be generated by the following method)
2.Utilizing a battery and chemical reactions (Direct current can be generated through this method)
Here, the wind's kinetic energy provide the mechanical energy for the generator to to produce power lines. Hence option A is correct. All others are static electricity for short time only.
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Which famous astronomer discovered jupiter’s largest moons?.
Answer:
Galileo Galilei
Explanation:
The famous astronomer Galileo Galilei was the one who discovered Jupiter’s large moons.
I hope it helps! Have a great day!
Muffin ^^
Answer:
Galileo Galilei
Explanation:
The great and famous astronomer Galileo Galilei was the one that discovered Jupiter’s largest moons.
I hope it helps! Have a great day!
Anygays-
You want to determine whether the mass of an object attached to a parachute affects the time it takes to fall to the ground. In this investigation, would "the material the parachute is made out of" be a suitable control variable? no or yes
The material the parachute is made out of" will not be a suitable control variable as it is needed in the research.
What is a control variable?It should be noted that a control variable simply means any variable that is held constant in a research.
In this case, the material the parachute is made out of" will not be a suitable control variable as it is needed in the research.
Therefore, it's false.
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5. The amount of energy provided by a battery in a circuit is
the amount of energy consumed in the circuit.
A. Equal to
B. Less than
C. Greater than
D. Not related to
Which two characteristics might a model have if it is a three-dimensional model of magnetic force made by using a magnet and magnetic field lines? A. Some field lines have arrows that point in different directions. B. Arrows on the field lines point from the magnet's north pole to its south pole. C. The field lines are closest together in and near the magnet D. The field lines cross paths as they go from one pole of the magnet to the other.
Answer:
B C I suppose , though A is correct too
Explanation:
The arrows on the magnetic field lines point from the magnet's north pole to its south pole. The field lines are closest together in and near the magnet. Thus, the correct options are B and C.
What is Magnetic force?Magnetic force is the force of the electrically charged particles which are in motion, such as attraction, or repulsion results from their activity. It is the fundamental force behind the phenomena like how electric motors operate and magnets are drawn to metals.
Usually, when we draw magnetic field lines, we start to draw outwardly from the North pole to the South Pole. This same direction is prevalent on the Earth due to the fact that the Earth functions as a giant magnet. Thus, the model describes that the magnetic field lines will spread out of the north end of the magnet to the south end. The magnetic field lines are closest in and near the magnet.
Therefore, the correct options are B and C.
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Which of the following is NOT a chemical change/reaction?
Question 3 options:
2 liquids are combined, and a solid precipitate is formed
phase/state change (solid, liquid, gas)
production of gas bubbles
rusting metal
Answer:
rusting metal I think hehe
Please help
how long have people used coal as a source of fuel
A. 200 years
B. 1000 years
C. 3000 years
D. 5000 years
Answer:
c. 3,000
Explanation:
I am guessing 3000 years
The diagram shows the water levels inside the containers.
A)91 cm
B) 34 cm ( the water levels)
•) The density of water is 1000 kg/m²
ii) Calculate the pressure that the water causes at the base of container A.
Answer:
8927.1 Pa
Explanation:
pressure = height x density of liquid x g
= (91/100) x 1000 x 9.81
= 8927.1 Pa
The potential energy of a swing is 200 j at its highest point and 50j as its lowest point energy is conserved ,what is the kinetic energy of the swing at its lowest point
Answer:
150J
Explanation:
yee thats it hope it helps
If the distance between two objects is tripled, what happens
to the gravitational force between them?
A. It decreases to 1/3 its original magnitude.
B. It increases to 9 times its original magnitude.
C. It increases to 3 times its original magnitude.
D. It decreases to 1/9 its original magnitude.
.
Answer:
D)it decreases to 1/9 its original magnitude
If the gravitational force on an object is directly proportional to its mass, why don’t objects with large masses fall with greater acceleration than small ones?.
how are the four chambers in the heart connected by it
Answer:
I think it is atrioventricular valves
Explanation:
hope this helps