A fountain sends a stream of water 20.0 m up into the air. If the base of the stream is 10.0 cm in diameter, what power is required to send the water to this height?
30.5 kW
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Kinetic Energy: A truck has four times the mass of a car and is moving with twice the speed of the car. If Kt and Kc refer to the kinetic energies of truck and car respectively, it is correct to say that
A. Kt = 16Kc.
B. Kt = 4Kc.
C. Kt = 2Kc.
D. Kt = Kc.
E. Kt = 
Kc.
Given the equation 
, which answer or answers provide(s) the best description of a possible physical situation?
A. A 20.00-N tension pulls a 2.00-kg mass. The 2.00-kg mass pulls another 2.00-kg mass. B. A 20.00-N force pushes a 2.00-kg mass. The 2.00-kg mass pushes another 2.00-kg mass. C. A 2.00-kg mass on a flat surface is acted on by gravity while another 2.00-kg mass sits on top of it. D. All of the situations above are possible. E. Only (a) and (b) above are possible.
The geologist Harry Hess proposed the theory of
a. plate tectonics. b. continental drift. c. seafloor spreading. d. mountain building.
An atom which has 4 protons and 6 neutrons will be electrically neutral if it contains
A) 4 electrons. B) 6 electrons. C) 10 electrons. D) at least 1 electron.