What causes the large gaps in the asteroid belt (often called Kirkwood gaps)?
A) large asteroids that clear certain regions of the asteroid belt
B) tidal forces from Jupiter
C) tidal forces from the Sun
D) orbital resonances with Jupiter
E) the competing gravitational tugs of Mars and Jupiter
D) orbital resonances with Jupiter
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When a bicycle pedal is at the top of its motion, you can exert the greatest torque on the crank by
A. hooking your toes under the pedal and pulling upward. B. pushing straight forward on the pedal with your foot. C. pushing straight down on the pedal with your foot.
Give at least one example of each of the following:
(a) longitudinal standing wave. (b) transverse standing wave.
What is the net power that a dog with surface area of 0.075 m2 radiates if his emissivity is 0.75, his skin temperature is 315 K, and he is in a room with a temperature of 290 K? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4)
A) 9.0 W B) 6.0 W C) 8.0 W D) 15 W E) 18 W
If a charged particle is moving in a uniform magnetic field, its path can be:
a. a straight line. c. a helix. b. a circle. d. any of these choices.