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nadezda [96]
4 years ago
15

What is the correct formula for power? A. Power = work / time B. Power = work * time C. Power = force * distance D. Power = work

* distance
Physics
2 answers:
Korolek [52]4 years ago
5 0

Answer:

A. P=W÷t

Explanation:

steposvetlana [31]4 years ago
3 0

Answer:

A. Power = Work / Time

Explanation:

Power is the amount of work done over time, or rather the rate of work, which is given by the unit of watts (W). Since work is defined by Force * Displacement, we can also say Power = Force * Displacement / Time.

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Car and a train move together along straight, parallel paths with the same constant cruising speed v0. At t=0 the car driver not
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Answer:

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Part B: t = v_0/a_0

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v = v_0 + at\\0 = v_0 - a_0t\\t = \frac{v_0}{a_0}

Part B:

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Part C:

The total time takes is 2t.

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And the car moves a distance in Part A and in Part B:

d_A = v_0t + \frac{1}{2}at^2 = v_0(\frac{v_0}{a_0}) - \frac{1}{2}a_0(\frac{v_0^2}{a_0^2}) = \frac{v_0^2}{a_0} - \frac{v_0^2}{2a_0} = \frac{v_0^2}{2a_0}\\d_B = v_0t + \frac{1}{2}at^2 = 0 + \frac{1}{2}a_0(\frac{v_0^2}{a_0^2}) = \frac{v_0^2}{2a_0}

So the total distance that the car traveled is d = \frac{v_0^2}{a_0}

The difference between the train and the car is

x - d = \frac{2v_0^2}{a_0} - \frac{v_0^2}{a_0} = \frac{v_0^2}{a_0}

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3 years ago
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