physics
posted by stephanie .
What is the average useful power output of a person who does 5.50×106 J of useful work in 6.50 h?
Working at this rate, how long will it take this person to lift 1850 kg of bricks 1.20 m to a platform? (Work done to lift his body can be omitted because it is not considered useful output here.)

physics 
Damon
assume you mean 5.50 * 10^6 Joules
6.50 hr * 3600 s/hr = time in seconds
power = Joules / time in seconds
( which is Watts )
part B:
power * time = 1850 * 9.81 * 1.20
Respond to this Question
Similar Questions

physics
an elevator lifts 4 person each with an average mass of 72 kg to a height of of 20 metre in one minute calculate 1 the work done by the lift and 2 the power exerted 
physics
A 30 kg person climbs up a 5 m rope at a constant speed. If the student’s power output is 2 kW, how long does it take for the student to climb the rope? 
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 
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 
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 
Science
An elevator lifts a person weighing 625 newtons a distance of 7 meters. If the elevator uses 875 watts of power to lift the person, how long does it take? 
Physics
What is the average useful power output of a person who does 5.90×106 J of useful work in 7.90 h? 
Physics
What is the average useful power output of a person who does 5.90×106 J of useful work in 7.90 h? 
physics
What is the average useful power output of a person who does 5.50×106 J of useful work in 6.50 h? 
physics
What is the average useful power output of a person who does 5.50×106 J of useful work in 6.50 h?