Suppose you stand on a weighing scale and all of a sudden the atmosphere vanishes. The reading on the scale would
A) increase.
B) decrease.
C) remain the same.
Answer: A
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Three identical bar magnets, each 2 cm long, are placed in a straight line on a frictionless surface with their ends equally spaced with 2 cm between ends. They are constrained so they cannot rotate, but they can slide along the straight line. The left magnet has its north pole nearest the north pole of the middle magnet, and the right magnet has its south pole toward the middle magnet’s south pole. Once they are in place and released from rest, which of the following best describes the motion of the magnets?
a. The end magnets will move away from the center magnet.
b. The magnets will not move since they are equally spaced.
c. The magnets will snap together.
d. None of the above would happen.
Observer A sees a ruler moving by in a relativistic train and measures its length to be LA. Observer B moves together with the train and measures the length of the ruler to be LB. These two results will be such that
A) LA > LB. B) LA = LB. C) LA < LB. D) LA could be greater or smaller than LB depending on the direction of the motion.
The absolute pressure depends on
a. the weight of the fluid. b. the atmospheric pressure. c. the cross-sectional area. d. the gauge pressure.
Which of the following temperature scales has the smallest unit interval?
a. Celsius b. Kelvin c. Fahrenheit d. None of these