Ice crystals in nearly frozen liquid water make up a
A) microscopic slush.
B) region of lower density.
C) both of these
D) neither of these
Answer: C
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A 2.0-kg block is projected down a plane that makes an angle of 20° with the horizontal with an initial kinetic energy of 2.0 J. If the coefficient of kinetic friction between the block and plane is 0.40, how far will the block slide down the plane before coming to rest?
a. 3.0 m b. 1.8 m c. 0.30 m d. 1.0 m e. 1.3 m
A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse it has received from the gravitational force is
a. 9.80 Ns. b. 19.6 Ns. c. 29.4 Ns. d. 58.8 Ns. e. 118 Ns.
Solar energy
a. is a recent invention b. has been used for a long time c. has not yet been successfully developed d. is indirectly the source of most of the energy we use
For electromagnetic radiation of intensity of
what is the rms value of the electric field?
a. 
b. 
c. 
d. 
e. 