To work off a large pepperoni pizza you ate on Friday night, onSaturday morning

Question

To work off a large pepperoni pizza you ate on Friday night, onSaturday morning you climb a 120-m-high hill. (a) Assuminga reasonable value for your mass, determine your increase ingravitational potential energy. (b) Where does this energycome from? (c) The human body is typically 20 percentefficient. How much energy was converted into thermal energy?(d) How much chemical energy is expended by you during theclimb? Given that oxidation (burning) of a single slice ofpepperoni pizza releases about 1.0 MJ (250 food calories) ofenergy, do you think one climb up the hill is enough?

Explanation / Answer

let 4 be the number of slices a pepperonipizza contains then energy liberated during combustion of it is106*4J a)average mass is 75 kg increase in gravitational potentialenergy=75*9.8*120=88200J b)this energy come from the food we take c)20 percent efficient =>80%converted in to thermal energy=0.8*106*4J d)energy spent while climbing up is 88200J he is able to climb up as 0.2*106*4J is greater than88200J

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