In his special theory of relativity, Einstein stated that the laws of physics are
A) different in different situations.
B) common sense applied to microscopic and macroscopic things.
C) the same in all frames of reference.
D) the same in all uniformly moving frames of reference.
Answer: D
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The 500 m-long spaceship Springbrake is at rest on the planet Hitest for refueling. Another spaceship, Summerbrake, passes parallel to Springbrake at 0.600c. The crew on Springbrake measure the length of Summerbrake as it passes and find that the length they measure is exactly the same as the known 500 m rest length of Springbrake. If Summerbrake were at rest next to Springbrake, its length would
then be measured to be a. 180 m. b. 320 m. c. 500 m. d. 625 m. e. 781 m.
Which of the following explains why we do not consider the surface of Mars to be habitable today?
A) Mars has too much carbon dioxide in its atmosphere. B) Mars is located far outside the Sun's habitable zone. C) The atmospheric pressure is too low for liquid water to be stable on the surface. D) Mars is bombarded too often with asteroids and comets. E) Mars has too little gravity for its surface to be habitable.
Two parallel wires carry currents in the same direction and exert a force on each of magnitude F for each meter of length. One of the currents is now reversed in direction and doubled in magnitude. What are the resulting magnitude for the force per meter of length and its direction relative to the wires?
1.2F, attractive 2.2F, repulsive 3.4F, attractive 4.4F, repulsive
Which are compact objects?
a. black holes b. neutron stars c. white dwarfs d. All of the other choices are correct.