(a) What is the efficiency of an out-of-condition professor who does 2.30 ✕ 105 J of useful work while metabolizing 490 kcal of food energy? (Enter your answer as a percentage. Enter a number.)  % (b) How many food calories (in kcal) would a well-conditioned athlete metabolize in doing the same work with an efficiency of 25%? (Enter a number.)  kcal

What is the efficiency of an out-of-condition professor who does 1.90 ✕ 105 J of useful work while metabolizing 510 kcal of food energy? (Enter your answer as a percentage. Enter a number.)% How many food calories (in kcal) would a well-conditioned athlete metabolize in doing the same work with an efficiency of 25%? (Enter a number.)kcal

A car with a mass of m = 980 kg climbs a slope at a constant speed of s = 11.8 m/s and encounters air resistance and friction that totals f = 570 N. The power of the engine is P = 135 kW, but the efficiency is e = 0.37. (In other words, the power delivered to the car is e = 0.37 times the power of the engine.)Write an expression for sin(φ), where φ is the maximum slope angle for which the car can maintain the given speed.Your answer should be in terms of the symbols given in the problem statement and g (the acceleration due to gravity).

An aquarium 3 m long, 6 m wide, and 1 m deep is full of water. Find the work (in J) needed to pump half of the water out of the aquarium. (Use the facts that the density of water is 1000 kg/m3 and gN 9.8.)