Two identical balls are at rest side by side at the bottom of a hill. Some time after ball A is kicked up the hill, ball B is given a kick up the hill. Ball A is headed downhill when it passes ball B headed up the hill. At the instant when ball A passes ball B,
a. it has the same position and velocity as ball B.
b. it has the same position and acceleration as ball B.
c. it has the same velocity and acceleration as ball B.
d. it has the same displacement and velocity as ball B.
e. it has the same position, displacement and velocity as ball B.
b
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Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 4 sin (5x) cos (6t) where x is in m and t is in s. What is the approximate frequency of the interfering waves?
a. 3 Hz b. 1 Hz c. 6 Hz d. 12 Hz e. 5 Hz
Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?
A) The star is a member of a binary star system. B) The star is of spectral type G. C) The star is of spectral type A. D) We know the star's luminosity and distance.
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What will be an ideal response?
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.