A person with a mass of 60 kg climbs up to a diving board 4 meters above a swimming pool. (a) How much work does the person do? (b) What is the diver's kinetic energy upon entering the water after diving off?
(a) 2,352 J, (b) 2,352 J
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Every heat engine
A) gains heat from a high-temperature reservoir. B) converts energy into mechanical work. C) expels heat to a lower-temperature reservoir. D) all of the above E) none of the above
A hornet circles around a pop can at increasing speed while flying in a path with a 12-cm diameter. We can conclude that the hornet's wings must push on the air with force components that are
A. straight down. B. down and inwards. C. down and outwards. D. down and backwards. E. down, backwards and outwards.
How many significant figures are in 0.0037010?
A) four B) five C) six D) seven E) eight
The amount of friction that occurs when two blocks slide against each other depends on
A) how much they are pressed together. B) the "stickiness" of atoms on their surfaces. C) the kinds of material being pressed. D) all of the above