# physics

posted by .

If a man has an average useful power output of 31 W, what is the minimum time, in s, it would take him to lift fifty 12.3 kg boxes a height of 2.3 m.

i'm not sure how to go about it if anyone can help me
Thanks

• physics -

See your 8:59am post for solution.

## Similar Questions

1. ### Physics

A weightlifter raises a 90k-g barbell from the floor to a height of 2/2 m in 0.6 s. What was his average power output during his lift?
2. ### Physics

What is the average power output of a weightlifter who can lift 260 kg to a height of 1.9 m in 1.8 seconds?
3. ### physics

A lift is used to carry boxes to the top floor of a hotel 20m high.A total weight of 100kg of boxes was caried up in 20second.If the useful output of the engine driving the lift mechanism is 1.2 kilowatt.calculate the efficiency of …
4. ### physics

If a man has an average useful power output of 31 W, what is the minimum time, in s, it would take him to lift fifty 12.3 kg boxes a height of 2.3 m. i'm not sure how to go about it if anyone can help me Thanks
5. ### Physics

If a man has an average useful power output of 31 W, what is the minimum time, in s, it would take him to lift fifty 12.3 kg boxes a height of 2.3 m. i'm thinking i should find the work done then find power with p = work/time
6. ### Physics

What is the average useful power output of a person who does 5.90×106 J of useful work in 7.90 h?
7. ### Physics

A record was set for stair climbing when a man ran up the 2100 steps of the Empire State Building in 15 minutes and 10 seconds. If the height gain of each step was 0.2 m, and the man's mass was 73.0 kg, what was his average power output …
8. ### physics

What is the average useful power output of a person who does 5.50×106 J of useful work in 6.50 h?
9. ### physics

What is the average useful power output of a person who does 5.50×106 J of useful work in 6.50 h?
10. ### physics

What is the average useful power output of a person who does 5.50×106 J of useful work in 6.50 h?

More Similar Questions