Give an example in which velocity is zero yet acceleration is not.
What will be an ideal response?
Answer: A ball is thrown into the air and its velocity is zero at the apex of the throw, but acceleration is not zero.
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After a supernova explosion, the remains of the stellar core ________
A) will always be a neutron star B) may be either a neutron star or a black hole C) will always be a black hole D) may be either a white dwarf, neutron star, or black hole
Two concentric imaginary spherical surfaces of radius R and 2R, respectively, surround a positive point charge Q located at the center of the surfaces. When compared to the electric flux ?1 through the surface of radius R, the electric flux ?2 through the surface of radius 2R is
A.
.B.
.C.
D.
E.
When light passes through common windowpane, its angle of emergence is
A) usually less than its angle of incidence. B) always less than its angle of incidence. C) the same as its angle of incidence. D) usually more than its angle of incidence. E) always more than its angle of incidence.
A block lies on a smooth inclined plane tilted at an angle of 35° to the horizontal. (a) Draw the free-body diagram for the block. (b) Determine the block's acceleration as it slides down the inclined plane
(c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline. (d) How long did it take the block to reach the bottom of the inclined plane?