What is this equation for?

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Answer 1

Answer: That's the equation for the efficiency of any machine or other system that you use to change energy from one form to another. It says that the efficiency of that device is equal to the work or energy that comes out of it divided by the work or energy that you put into it.

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two identical freight cars roll without friction towards each other on a level track. one car rolls 2 m/s the other 1 m/s. after the cars collide they couple and roll together with a speed of

Answers

The cars coupled and rolled together at a speed of 1.5 m/s.

What is law of conservation of linear momentum?

According to the law of conservation of linear momentum, the sum of the momentum before and after the collision must be equal.

m₁ u₁ + m₂u₂ = m₁ v₁ + m₂ v₂

where m₁ and m₂ is the mass of the collided objects, u₁ and u₂ are their initial speed while v₁ & v₂ is their final speed.

The linear momentum of an object can be defined as the product of the mass of the object times the velocity of that object. Conservation of momentum is a property held by an object where the total amount of momentum never changes.

Given the initial velocity of the car is u₁ = 2 m/s and the other car is u₂ = 1 m/s.

The masses of both cars is identical, m₁ = m₂ = m

From the law of conservation of momentum, find the speed of coupled cars (v),

m₁ u₁ + m₂ u₂ =m₁ v₁ + m₂v₂

m × 2 + m ×1 = m × v + m × v

2 + 1 = 2 v

2v = 3

v = 1.5 m/s

Therefore, the speed of the coupled cars is equal to 1.5 m/s.

Learn more about the law of conservation of linear momentum, here:

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If they have identical weights the momentum is 2*m for one and -1*m for the other one. The total momentum is m, while the total mass is 2*m, giving a final speed of 0.5 m/s :|

The mass of ball A is 10 kilograms and the mass of ball B is 5 kilograms. If the initial velocity is set to 3 meters per second for each ball, what is the final velocity of ball B if the final velocity of ball A is 2 meters per second? Use the elastic collision equation to find the final velocity of ball B. Assume ball A initially moves from right to left and ball B moves in the opposite direction. Identify each mass, velocity, and unknown. Show your work, including units, and indicate the direction of ball B in your answer.

Answers

the awnswer is A i think

Bjorn is holding a tennis ball outside a second floor window (3.5 meters from the ground) and billie jean is holding one outside a third floor window (6.25 meters from the ground) how much more GPE does billie jean's tennis ball have? (each tennis ball has a mass of 0.06 kg)

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The answer is 1.01 x 10^(-11) N. I arrived to this answer through calculating the GPEs of both balls. Bjorn's ball has a GPE of 1.402 x 10^(-11) N. Billie Jean's ball has a GPE of 2.503 x 10^(-11) N. I subtracted the two and I found that Billie Jean's tennis ball has a GPE of 1.01 x 10^(-11) more than Bjorn's tennis ball.

The spectrum produced by a prism or a raindrop is evidence that the average speed of light in the material depends on the light'sA. transmission qualities.
B. color.
C. wave nature.
D. particle nature.

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The correct answer for the question that is being presented above is this one: "B. color." The spectrum produced by a prism or a raindrop is evidence that the average speed of light in the material depends on the light's color. White light is being refracted into different colors.

PLLLZ HELP Compare and contrast electric potential energy and electric potential difference? Please use 2 content related sentences

Answers

The electric potential difference is the electric potential energy per unit charge

Explanation:

First of all, we define the concept of electric potential. The electric potential is a measure of the gradient of the electric field at a certain point of the space. The electric potential at a distance $r$ from a positive charge of magnitude $q$ is given by

$V(r) = (kq)/(r)$

where k is the Coulomb's constant.

Now we can define the electric potential energy and the electric potential difference:

Electric potential energy is the energy possessed by a charge due to the presence of an electric field. For a charge of magnitude $q$ immersed in an electric field, its potential energy is given by $U=qV$ , where V is the electric potential at the location of the charge.
The electric potential difference is simply the difference in electric potential between two points in the space. For instance, if the potential at point A is V(A) and the potential at point B is V(B), then the potential difference is $\Delta V = V(A)-V(B)$

The electric potential energy is also defined as the work done on a charge q moved through a potential difference of $\Delta V$ . Consequently, the potential difference $\Delta V$ represents the work per unit charge done, i.e. the work done when moving a unitary charge through a potential difference $\Delta V$ .

Learn more about potential difference and current:

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3m/s North is an example of a____

Answers

That's a velocity vector.

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