According to a postulate of Einstein, which of the following describes the nature of the laws of physics as one observes processes taking place in various inertial frames of reference?
a. Laws are same only in inertial frames with zero velocity.
b. Laws are same only in inertial frames moving at low velocities.
c. Laws are same only in inertial frames moving at near speed of light.
d. Laws are same in all inertial frames.
d
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Interstellar gas clouds may collapse to form stars if they
a. have very high temperatures. b. encounter a shock wave. c. rotate rapidly. d. are located near main sequence spectral type K and M stars. e. All of the other choices are correct.
Due to the galaxy density and collisions, ________ are rare in the centers of clusters
A) irregulars B) quasars C) spirals D) black holes E) blazars
An atom is excited when one or more of its electrons
A) vibrates. B) is boosted into higher energy levels. C) undergoes a frequency change. D) becomes frantic.
A stone is held at a height h above the ground. A second stone with four times the mass of the first one is held at the same height. The gravitational potential energy of the second stone compared to that of the first stone is
A) one-fourth as much. B) one-half as much. C) twice as much. D) four times as much. E) the same.