PHY 102 (Atoms to Galaxies), HW4, Bergfield (ISU) (Questions with correct answers; verified)

The SI units of work are A. Calories B. Kilocalories C. Joules D. Watts E. Newtons correct answers C. Joules An elevator lifts a person from the 1st floor to the 4th floor in 30s. If the power output of the elevator is 5800W, what is the work done by the elevator? A. 174,000 J B. 12,431 J C. 58,000 J D. 58 J E. none of these correct answers A. 174,000 J A 75 kg man climbs the stairs to the fifth floor of a building, a total height of 16 m. His potential energy has increased by approximately A. 12000 J B. 59000 J C. 47000 J D. 38000 J E. 5900 J correct answers A. 12000 J A ball rolling down an incline has its maximum kinetic energy at A. the top. B. a quarter of the way down. C. halfway down. D. three-quarters of the way down. E. the bottom. correct answers E. the bottom. The power required to exert 64N of force over a distance of 8m in 32 seconds is A. 128 W B. 32,000 W C. 16 W D. 96 W E. impossible to predict correct answers C. 16 W A diver who weighs 500 N steps off a diving board that is 10 m above the water. The diver hits the water with kinetic energy of A. 10 J. B. 500 J. C. 510 J.