A sprinter of mass 100.0 kg accelerates from rest to 13.0 m/s on a flat track in 3 s. In the following treat the effect of air resistance to be negligible. Include units as appropriate. (a) What is his power output (also called useful power out) during this time? P = (b) The sprinter trains by sprinting up a small incline. If he is to accelerate from rest to 13.0 m/s in 3s on a grade of 10, what is his power output during this time interval? P = Rowan's and Jean's rates of energy consumption (which equals the power expended) doing various activities are given below. (Values from Table 7.5 in Urone and J. Appl. Physiol., 75, p2514-2520, 1993). kJ = Activity Rate of energy consumption sleeping sitting studying walking cycling Rowan kJ = Jean 75 W 110 W 120 W Activity Rate of energy consumption sleeping sitting studying walking cycling 280 W 400 W (a) What are Rowan's daily energy needs in both kJ and kcal if his day consists of sleeping for 8 hrs, walking for 2 hrs, studying for 10 hrs, cycling for 1.5 hrs and sitting for 2.5 hrs? Rowan's energy needs are (b) What are Jean's daily energy needs in both kJ and kcal if her day also consists of sleeping for 8 hrs, walking for 2 hrs, studying for 10 hrs, cycling for 1.5 hrs and sitting for 2.5 hrs? Jean's energy needs are kcal 55 W 95 W 105 W 280 W 400 W kcal