While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 watts during a race, how fast is the person running? Assume a running step is 1.5 m long
2.92 m/s
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A ball is thrown straight up. Neglecting air resistance, which statement is not true regarding the energy of the ball?
(a) The potential energy decreases while the ball is going up. (b) The kinetic energy decreases while the ball is going up. (c) The sum of the kinetic energy and potential energy is constant. (d) The potential energy decreases when the ball is coming down. (e) The kinetic energy increases when the ball is coming down.
How many moles are there in 2.00 kg of copper? The atomic mass of copper is 63.5 g/mol and its density is 8.90 g/cm3
A) 15.3 B) 31.5 C) 51.3 D) 53.1
As seen in 1987, when two silicon 28 nuclei fuse, or when seven alpha particles are added to a Si-28 nucleus, the initial result in either case is:
A) the shedding of bipolar planetary nebula shells. B) a nova explosion. C) iron 56. D) cobalt 56. E) nickel 56.
In order to see a distant star during a total eclipse of the Sun you must look for it in a direction that is farther from the Sun than the direction you would normally look for the star
Indicate whether the statement is true or false