Laplace's nebular hypothesis was problematic in that he could not explain ____
a. the different types of planets
b. the rotational direction of the planets
c. how the Sun had <0.5% of the Solar System's angular momentum
d. how one star could come within a close encounter of another star
e. how gravity was the dominant force of planet formation
c
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The primary difference between the special theory of relativity and the general theory of relativity is that the general theory also describes
A) the nature of gravity. B) length contraction. C) time dilation. D) the constancy of the speed of light.
If the Sun collapsed to a black hole, Earth's speed in space would
A) increase. B) decrease. C) remain the same.
A metal rod of length L in a region of space where a constant magnetic field points into the page rotates about an axis through its center at constant angular velocity ?. The ends, A and E, make contact with a split ring that connects to an external circuit. The current in the external circuit of resistance R has magnitude
a.
0.
b.
While standing at a crosswalk, you hear a frequency of 540 Hz from an approaching police car. After the police car passes, its frequency is 480 Hz. What is the speed of the police car? (speed of sound = 340 m/s)
a. 13.1 m/s c. 20.0 m/s b. 17.4 m/s d. 26.2 m/s