For all transparent material substances, the index of refraction
A) is less than 1.
B) is greater than 1.
C) is equal to 1.
D) is less than or equal to 1.
E) is greater than or equal to 1.
B
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Multiple-Object Accelerating Systems: A locomotive is pulling 9 freight cars, each of which is loaded with the same weight. The mass of each loaded car is 37,000 kg, and we can neglect friction on these 9 cars. If the train is accelerating forward at 0.81 m/s2 on a level track, what is the tension in the coupling between the second and third cars? (The car nearest the locomotive is counted as the first car.)
Fill in the blank(s) with the appropriate word(s).
The diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar's surface temperature and luminosity during Stage 3, when it is undergoing radiative contraction and its life track moves up and to the left?
A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.
The drawing below is supposed to be a free-body diagram of a box that sits without slipping on the back of a truck that is moving to the right but is slowing down. Is the diagram correct?
A. Yes.
B. No, 
should point leftward.
C. No, the label should be .
D. No, there should be a leftward drag force.
E. No, 
should not be equal to 
.
F. No, there is some other problem (specify).
A projectile's vertical velocity component
a. changes most rapidly near the top of its trajectory. b. changes at a constant rate. c. changes most rapidly near the bottom of its trajectory. d. does not change.