Module 27 power & amp; efficiency Saturday, October 21, 2023 2:26 PM 1) a. What is the average useful power output (in W) of a person who does 5.40 X 106J of useful work in 8.40 h? _w b. Working at this rate, how long (in s) will it take this person to lift 2500 kg of bricks 1.30 m to a platform? (Work done to lift his body can be omitted because it is not considered useful output here.) 5 2) Because it can go from rest to 24.3 m/s (about 54 mi/h) in 3.6 5, one of the fastestaccelerating animals is the cheetah. If its mass is 51.0 kg, determine the average power developed by the cheetah during the acceleration phase of its motion. Express your answer in the following units. a W b. hp 1) Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. Suppose a person shoveling a sidewalk metabolizes food at the rate of 700 W. (The efficiency of a person shoveling is 3%.) a. What is her useful power output (in W)? b. How long (in s) will it take her to lift 3,500 kg of snow 1.20 m? (This could be the amount of heavy snow on 60.0 ft of sidewalk.) c. How much waste heat (in J) will she generate in the process