What evidence do we have that the surface of Mars has never divided into moving plates?
What will be an ideal response?
The vast size of Olympus Mons is evidence that the crust of Mars must have remained stationary over the hot spot (magma source), and Mars has not had horizontal plate tectonics.
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The switch in the figure is closed at t = 0 when the current I is zero. When I = 15 mA, what is the potential difference across the inductor?
a.
240 V
b.
60 V
c.
0
d.
180 V
e.
190 V
If kinetic energy is conserved by the apparatus shown in this figure, why do we find in class demonstrations that the balls eventually come to rest?
a. Because the commercial versions of this apparatus are not built to exact specifications. b. Total energy, not kinetic energy, is conserved; the rest of the energy going to heat; but the heat loss in this experiment is normally ignored since it occurs very slowly. c. Because as some of the balls come to rest, others speed up. d. Because a hidden battery supplies the energy to keep the balls moving, and eventually runs out of energy. e. Total energy but not kinetic energy is conserved, the rest of the energy going to heat; but the device transforms the thermal energy back to kinetic energy.
The speed of a seismic wave depends on
A) the type of material it travels through. B) how far it has to travel. C) its amplitude. D) its frequency.
A small railroad car is pulled by a rope as shown in the sketch (top view). The force F that the rope exerts on the car has a component along the track and another component perpendicular to the track
Judging from the diagram, the larger of these two components would be 1) along the track. 2) perpendicular to the track. These components will be equal if 3) the rope makes an angle of 45° with the track. 4) the rope is pulled in a direction along the track, rather than at an angle to it. 5) they form an action-reaction pair on the car. 6) but they can never really be equal.