(a)
m = 60 kg
h = 3.7m
Total floors = 86
Total Heigth gained = 86*3.7 =318.2 m
Gravitational potential energy gained = m*g*h = 60*9.8*3218.2
J
Gravitational potential energy gained = 1892301.6 J
(b)
Let the total energy be x.
0.25 * x = 1892301.6
x = 7569206.4 J
(c)
1 calorie = 4.2 joules
Calories burned = 7569206.4 /4.2 = 1802192 calories
Calories burned = 1802.2 kcal
(d)
Calories converted to thermal energy = 0.75* 1802.2 kcal
Calories converted to thermal energy = 1351.65 kcal
Just before class starts in the spring, you take a quick trip to New York City...
The winning time for the 2005 annual race up 86 floors of the Empire State Building was 10 min and 49 s. The winner's mass was 60 kg. If each floor was 3.7 m high, what was the winner's change in gravitational potential energy? If the efficiency in climbing stairs is 25 %, what total energy did the winner expend during the race? How many food Calories did the winner "burn" during the race? What was the winner's metabolic power...