# physics

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.)

92.6 s correct

can someone give me the steps to achieve these answers?

1. 👍 0
2. 👎 0
3. 👁 238
1. 6.5 h * 3600 s/h = 23400 seconds
so
5.5 * 10^6/2.34*10^4 watts

work done = m g h = 1850*9.81*1.2
power = work/time
235 = work/time
so
time = work/235

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Physics

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

asked by Emily Ann on March 22, 2016
2. ### physics

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

asked by bill on November 17, 2017
3. ### physics

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

asked by stephanie on November 14, 2017
4. ### Physics

What is the average useful power output of a person who does 5.90×106 J of useful work in 7.90 h? I got 207 W Working at this rate, how long will it take this person to lift 2400 kg of bricks 1.30 m to a platform? (Work done to

asked by Emily Ann on March 22, 2016
5. ### Math

7.28) Confirm the values for the power output of the heart given in table 7.2 for an active person by starting with the values for a restong person and assuming a 50% increase in blood pressure and a factor of 4 increase in flow.

asked by Sean Francis C. Nocete on January 3, 2020
1. ### phsycis

A 62 kg hiker climbs to the top of a 3700 m-high mountain. The climb is made in 5.0 h starting at an elevation of 2600 m. Calculate the average power output in watts. Calculate the average power output in horsepower.

asked by peyton on March 2, 2010
2. ### physics

A 64 kg hiker climbs to the top of a 3700 m-high mountain. The climb is made in 5.5 h starting at an elevation of 2900 m. Calculate the average power output in watts. Calculate the average power output in horsepower & Calculate

asked by mike on October 10, 2010
3. ### Physics

The power output of an elevator is 15000 W. How many persons could it carry if it raises passenger to a height of 35 m in 20 s ( each person has an average mass of 60 kg)?

asked by HiHello on October 20, 2014
4. ### physics

A nuclear power plant has an electrical power output of 1900 MW and operates with an efficiency of 32%. If excess energy is carried away from the plant by a river with a flow rate of 1.0 106 kg/s, what is the rise in temperature

asked by Annette on April 29, 2013
5. ### physics

Water drops over 49 m high Niagara Falls at the rate of 6.0 106 kg/s. If all the energy of the falling water could be harnessed by a hydroelectric power plant, what would be the plant's power output? it says they want the answer

asked by Anonymous on February 19, 2011

More Similar Questions