A 1.15-kg grinding wheel 22.0 cm in diameter is spinning counterclockwise at a rate of 20.0 revolutions per second. When the power to the grinder is turned off,
the grinding wheel slows with constant angular acceleration and takes 80.0 s to come to a rest.
(a) What was the angular acceleration (in rad/s2 ) of the grinding wheel as it came to rest if we take a counterclockwise rotation as positive?
(b) How many revolutions did the wheel make during the time it was coming to rest?
(a) -1.57 rad/s2 (b) 800 revolutions
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When a cannonball is fired from a cannon, which undergoes the greater acceleration?
A) the cannonball B) the recoiling cannon C) both the same
If a star appears to move back and forth relative to other stars over a six-month period, this motion is due to the star's:
A) transverse motion. B) radial motion. C) parallax shift. D) Doppler shift. E) true space motion.
A refracting telescope uses
A. Mirrors to create the image. B. Only lenses to create the image. C. The name has nothing to do with the information in this chapter.
According to kinetic theory, a typical gas molecule in thermal equilibrium at room temperature has a kinetic energy K = 6.00 × 10^?21 J, regardless of mass. Estimate the speed at room temperature of a hydrogen molecule H2 (m = 3.34 × 10^?27 kg) and a xenon atom (m = 2.00 × 10^?25 kg). [kB = 1.38 × 10^?23 J/K]