Identical forces are exerted for the same length of time on two different objects. The magnitude of the change in momentum of the lighter object is
A) smaller than the magnitude of the change in momentum of the larger mass object, but not zero.
B) larger than the magnitude of the change in momentum of the larger mass object.
C) exactly equal to the magnitude of the change in momentum of the larger mass object.
D) zero.
E) There is not enough information to answer the question.
C
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An adjustable bracket with a collar slides on a pole and is held in place by friction at A and B. The min- imum coefficient of static friction between the pole and collar so that the collar is self-locking against the pole under applied load F is:
(A) 0.25
(B) 0.31
(C) 0.42
(D) 0.83
What is the beat frequency produced when two sound waves differ by two hertz?
a. Two per minute. b. One-half hertz. c. Two hertz. d. One hertz. e. Ten hertz.
How do you measure the mass of the supermassive black hole at the center of the Milky Way?
A.) Look at the amount of light that it emits and apply the inverse square law for brightness. B.) Look at the orbits of nearby stars and apply Kepler's Third Law. C.) See how fast it sucks stars in from the outer parts of the galaxy. D.) Look at a spectrum of the black hole and measure its spectral type. E.) Find its temperature, and assuming it is a black body, calculate its mass.
Comparing the speed of sound in liquids, gases, and solids, the speed of sound is usually lowest in _____ and highest in _____
a. solids, liquids c. liquids, solids b. gases, liquids d. gases, solids