A child bounces a 50-gram superball on the sidewalk. The velocity of the superball changes from 21 m/s downward to 19 m/s upward. If the contact time with the sidewalk is 1/800 s, what is the magnitude of the force exerted on the superball by the sidewalk?
1 600 N
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The sensitive dependence upon initial conditions of the evolution of some physical systems is a feature of
a. gravitation. b. fractals. c. air resistance. d. dynamical chaos. e. quantum mechanics.
A 2.00 kg piece of lead at 40.0°C is placed in a very large quantity of water at 10.0°C, and thermal equilibrium is eventually reached. Calculate the entropy change of the lead that occurs during this process. The specific heat of lead is 130 J/(kg ? K)
A) -12.5 J/K B) 86.0 J/K C) -26.2 J/K D) -86.0 J/K E) -6.24 J/K
One hemisphere of Encedalus has a much younger crust than the other, which is heavily cratered
Indicate whether the statement is true or false
Why wasn't the intracluster medium in galaxy clusters discovered until the 1960s?
A) We did not know how much dark matter existed before then. B) We didn't have the resolution to observe galaxy clusters until then. C) The Milky Way was blocking our view of distant galaxy clusters. D) The medium emits X-rays, which are blocked by the Earth's atmosphere and require X-ray satellites in space in order to be observed. E) Radiation emitted by the medium was so dim that we couldn't detect it until we built much larger telescopes.