Weight and g: By how many newtons does the weight of a 100-kg person decrease when he goes from sea level to mountain top at an altitude of 5000 m? The mean radius of the earth is 6.38 × 106 m.
A. 0.60 N
B. 1.5 N
C. 2.6 N
D. 3.6 N
E. 9.8 N
Answer: B
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A student attaches a length of nylon fishing line to a fence post. She stretches it out and shakes the end of the rope in her hand back and forth to produce waves on the line. The most efficient way for her to increase the wavelength is to
A. increase the tension on the hose and shake the end more times per second. B. decrease the tension on the hose and shake the end more times per second. C. increase the tension on the hose and shake the end fewer times per second. D. decrease the tension on the hose and shake the end fewer times per second. E. keep the tension and frequency the same but increase the length of the hose.
A person carries a mass of 10 kg and walks along the +x-axis for a distance of 100 m with a constant velocity of 2 m/s. What is the work done by this person?
A) 0 J B) 20 J C) 200 J D) 1000 J E) None of the other choices is correct.
What is the phase difference when two waves, traveling in the same medium, undergo constructive interference?
a. 270° b. 180° c. 90° d. 0°
Which of the following is the best definition of inertial frame?
A. a frame of reference in which Newtonian mechanics holds true, but relativistic mechanics does not B. a frame of reference in which relativistic mechanics holds true, but Newtonian mechanics does not C. a frame of reference where there are no accelerations without applied forces D. a frame of reverence in which Newton's second and third laws hold, but not his first E. None of these choices are correct.