a. Suppose you want to run up Janss steps 100 times. Assume that all of the ener

Question

a. Suppose you want to run up Janss steps 100 times. Assume that all of the energy you burn while running up goes into increasing your gravitational potential energy even though in reality, your body is not 100 % efficient and some energy is lost (e.g. your muscle temperature increases). How many snickers bars would you have to eat so that the amount of energy you ingest equals the amount of energy' your body expends in the course of doing these 100 reps. b. Actually go to Janss steps and run up the steps as fast as you can one time. While you do this, time yourself. What was the average power output of your body when you did this? How does this compare to the power output of a car having 200 horsepower?

Explanation / Answer

total steps =87

heigh of each step=0.6 feet =0.183 m

total height=15.921 m

for 100 times total height=1592.1 m

let the weight is 75 kg

energy=mgh=75*9.8*1592.1=1170193.5 J=279682.95 cal=279.682 Kcal

energy of 1 snicker bar=73 kcal

total bar needed=3.8 almost equal to 4 bar

(b) let the time is t

power =energy/time

time need to be measured here ,then only we can proceed further

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