All the following statements are true. Which one is most important in explaining the tremendous tidal heating that occurs on Io?
A) Io orbits Jupiter on an elliptical orbit as a result of orbital resonances with other moons.
B) Io is the closest to Jupiter of Jupiter's large moons.
C) Io exhibits synchronous rotation, meaning that its rotation period and orbital period are the same.
D) Io orbits Jupiter in the Io torus, and therefore has a surface that is bombarded by many charged particles.
A) Io orbits Jupiter on an elliptical orbit as a result of orbital resonances with other moons.
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You have two tuning forks that have a beat frequency of 2 Hz with respect to each other. One of them has a frequency of 440 Hz, but you do not know the frequency of the other. You place a small piece of clay on the other, an amount just capable of changing the beat frequency by 1 Hz, and you repeat the experiment. This time the beat frequency is 3 Hz. From this information, what is the frequency
of the other tuning fork (when it has no clay on it)? 1.442 Hz. 2.443 Hz. 3.438 Hz. 4.437 Hz.
An ideal Carnot engine has an efficiency of 83.0% and performs 4500 J of work every cycle. How much energy is discharged to the lower temperature reservoir every cycle?
A) 920 J B) 830 J C) 740 J D) 3700 J E) 5400 J
John is carrying a shovelful of snow. The center of mass of the 3.00 kg of snow he is holding is 15.0 cm from the end of the shovel. He is pushing down on the opposite end of the shovel with one hand and holding it up 30.0 cm from that end with his other hand. Ignore the mass of the shovel. Sarah says that his hand pushing down on the shovel must be exerting a greater force than the hand pushing
up. James says it is just the reverse. Which one, if either, is correct? a. Sarah, because the hand pushing down must exert a greater force to match the torque exerted by the snow. b. James, because, depending on the location of the axis of rotation, the hand pushing down can counteract the torque exerted by the snow. c. James, because the hand pushing up must exert a force that equals the sum of the force of the hand pushing down and the weight of the snow. d. James, because both (b) and (c) above are correct. e. Neither, because the hands exert forces of equal magnitudes.
A model rocket of mass, m, is fired upward from a launch pad with some initial speed, v. A gravitational force is exerted on the rocket
1.at all points in its motion except at it highest point. 2.at all points in its motion. 3.at no points in its motion. 4.at none of these choices.