Clocks in a moving reference frame, compared to identical clocks in a stationary reference frame, appear to run
A. backward in time.
B. slower.
C. faster.
D. at the same rate.
Answer: B
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A 16 solar mass main sequence star is at a smaller distance than a 1solar mass mainsequence star. Which star appears brighter?
a) cannot tell with the information given b) stars are approximately the same brightness c) the 16 solar mass main sequence star d) depends on the phase of the Moon e) the 1 solar mass main sequence star
The Greenhouse Effect on Venus is due to ________ in its atmosphere
Fill in the blank(s) with correct word
A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity. If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 20 N between the crate and the surface, what is the force applied by the worker?
a. zero c. 30 N b. 50 N d. 40 N
How does the force between two otherwise unchanged electrical charges vary with distance?
a. The force decreases by the same factor that the distance increases. b. The force is proportional to the reciprocal of the distance. c. The force decreases by the square of the distance. d. The force increases by the amount of the distance. e. The force increases by the square of the distance.