A baseball pitcher, loosening up his arm before a game, tosses a 0.15-kg ball using only the rotation of his forearm, 0.32 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 24 m/s in a time of 0.40 s, what is the average angular acceleration of the arm and ball?
a. 0.067 rad/s2
c. 15 rad/s2
b. 94 rad/s2
d. 190 rad/s2
D
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The change in the frequency of a wave due to the motion of the source (or observer) is known as
A) the Bell effect. B) the Mach effect. C) the Doppler effect. D) interference. E) diffraction.
If a freely-falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s2, then its speed reading would increase each second by
A) 10 m/s. B) 20 m/s. C) 30 m/s. D) 40 m/s. E) depends on its initial speed
The light-gathering ability of a telescope is most dependent on the diameter of its primary objective
Indicate whether the statement is true or false
A 0.40-m radius automobile tire accelerates from rest at a constant 2.0 rad/s2 over a 5.0 s interval. What is the tangential component of acceleration for a point on the outer edge of the tire during the 5.0-s interval?
a. 33 m/s2 c. 0.60 m/s2 b. 0.80 m/s2 d. 0.30 m/s2