What is the primary reason why scientists accept the idea that the speed of light is the same for everyone?
A) because it makes sense when you think about it as Einstein did
B) because it has been verified by many observations and experiments
C) because no one has come up with a better idea about the speed of light
D) because the theory is just so darn cool, it can't be wrong
B
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The quantity which does not change in magnitude from that observed in system S when observed in system S' moving away from system S at speed v is
A.
.B.
.C.
D.
E.
Uranus and Neptune do not contain liquid metallic hydrogen because they
a. are not massive enough. b. do not contain enough hydrogen. c. rotate too slowly. d. are too far from the Sun. e. have magnetic fields that are much too weak.
As a 3.0-kg bucket is being lowered into a 10-m deep well, starting from the top, the tension in the rope is 19.6 N. The acceleration of the bucket will be:
a. 6.5 m/s2 downward. c. zero. b. 9.8 m/s2 upward. d. 3.3 m/s2 downward.
Which of the following phases of the Moon is most easily seen during the daytime (mid-morning or mid-afternoon, not near sunrise or sunset)?
What will be an ideal response?