A mechanic is examining the wheel of a bicycle to adjust the brake. With the bicycle off the ground, he manually rotates the wheel until it reaches an angular speed of 12.0 rad/s and then allows it to coast to a stop
If the wheel has a moment of inertia of 0.100 kg ? m2, and the wheel slows uniformly to a stop in 160 s, what is the magnitude of the retarding torque? A) 1.00 N ? m
B) 0.00750 N ? m
C) 0.0787 N ? m
D) 1.33 N ? m
E) 1.67 N ? m
B
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The Sun's magnetic field is evident in the looped shapes of
a. solar flares. b. sunspots. c. the corona. d. granules. e. prominences.
About 50 years after Uranus was discovered:
A) its rings were discovered. B) the retrograde motion of its orbit was observed. C) its orbit was too far off of its predicted path to be explained by observational errors. D) it was discovered that it had more natural satellites than any other planet. E) it was discovered that its atmosphere was featureless.
A cement truck can pour 40 cubic yards of cement per hour. Express this in ft3/min
a. 2/3 ft3/min c. 6 ft3/min b. 18 ft3/min d. 2.0 ft3/min
Which of the following best explains the phenomenon of black hole evaporation?
A) Due to high temperatures in the accretion disk around a black hole, material evaporates from the black hole like water evaporating from the ocean. B) Particles (or antiparticles) are occasionally ejected from within the event horizon, causing the black hole to lose mass. C) Particles (or antiparticles) are created by a quantum mechanical effect near, but outside, the event horizon of the black hole. The law of conservation of energy maintains that the black hole must lose energy to "pay" for the creation of this mass. D) Virtual particles created near the black hole are constantly annihilating each other, causing a very high temperature even if the black hole has no accretion disk. This high temperature provides escape velocity for the virtual particles, causing the entire "cloud" of virtual particles to expand away into space. E) Black hole evaporation is a virtual process, meaning that it has been theorized by astrophysicists but doesn't really occur.