A ball is thrown upward and caught when it returns. When air resistance affects the ball, compared with the initial upward speed, the speed of the ball when caught is
A) less.
B) the same.
C) more.
Answer: A
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Electric Field Lines: Two stationary point charges q1 and q2 are shown in the figure along with a sketch of some field lines representing the electric field produced by them. What can you deduce from the sketch?
A. q1 is negative and q2 is positive; the magnitudes are equal. B. q1 and q2 have the same sign; the magnitudes are equal. C. q1 is positive and q2 is negative; the magnitude of q1 is greater than the magnitude of q2. D. q1 is negative and q2 is positive; the magnitude of q1 is less than the magnitude of q2. E. q1 and q2 have the same sign; the magnitude of q1 is greater than the magnitude of q2.
Suppose Earth collapsed down to one-tenth of its present radius, while retaining all of its present mass. Compared to your present mass, your mass would be
A) reduced by a factor of 100. B) unchanged. C) reduced by a factor of 10. D) increased by a factor of 10. E) increased by a factor of 100.
Air at a temperature of 32° F has a relative humidity of 60%. If the temperature of the same air rises to 40° F, the relative humidity
a. stays the same b. increases c. decreases d. cannot be determined
State Huygen's principle
What will be an ideal response?