Consider a graph of instantaneous power versus time, with the veritcal P-axis st

Question

Consider a graph of instantaneous power versus time, with the veritcal P-axis starting at P = 0. What is the physical significance of the area under the P-versus-t curve between vertical lines at t_1 and t_2? It is 5.0 km from your home to the physics lab. As part of your physical fitness program, you could run that distance at 10 km/hr (which uses up energy at the rate of 700 W), or you could walk it leisurely at 3.0 km/hr (which uses energy at 290 W). Which choice would burn up more energy, and how much energy (in Joules) would it burn? Why is it that the more intense exercise actually burns up less energy than the less intense exercise? When a large car collides with a small car, which one undergoes the greater change in momentum: the large one or the small one? Or is it the same for both? In light of your answer to, why are the occupants of the small car more likely to be hurt than those of the large car, assuming that both cars are equally sturdy?

Explanation / Answer

problem 3 :

a)

Both car will experience same amount of change in momentum since initial and total momentum of the system of cars must be same according to conservation of momentum principle

b)

both cars experiene same amout of force. being the smaller car , the car is more susceptible to damage since smaller car is not strong enough to last the impact caused by the force. hence there are more chances of damage in case of smaller car

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