Power, Work And Force Ii

Name: ________________________________ Block:

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Power, Work and Force II P= W/t 1.

W=Fd

F= ma

a= 9.8 m/sec2

What is the mass if the work is 372 J and the object is moved 16 m?

2. How long would it take to move an 11 kg object 6 m with 42 W of power?

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3. How much power is needed to move a 7 kg mass 14 m in 16 seconds?

4. How long does it take to do 326 J of work with 16 watts?

5. How much work is done when you move a 24 kg mass 5 m?

6. What is the mass of an object if it took 264 J to move it 12 m?

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7. If you held a 14 kg box in your hands and walked forward 7 m in 3 seconds, how much was your power?

8. How long does it take to do 46 J of work with 7 watts of power?

9. A student who weighs 500 N climbed the stairs from the first floor to the third floor, 15 m above, in 20 seconds. a. How much work is done?

b. What is the power used?

10.A 5kg rock is lifted 2 m in 5 seconds. a. How much work is done?

b. What power is used?

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11.An elevator lifts 5 passengers 30 m in 24 seconds. The power is 15,000 watts. What is the total weight of the elevator and passengers?

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