Imagine that sound waves with a certain definite wavelength flow through a partially open sliding door. If the wavelength of the waves increases, the angle through which the sound waves are diffracted
A. Decreases.
B. Increases.
C. Remains the same.
D. Depends on quantities not specified (explain).
B. Increases.
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A ball falls from the top of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?
A) K is equal to U. B) K is greater than U. C) K is less than U. D) It is impossible to tell.
LR Circuits: A 1.50-H inductor is connected in series with a 200-? resistor through an ideal 15.0-V dc power supply and an open switch. How much energy is contained in the inductor 20.0 ms after closing the switch?
A. 0.910 mJ B. 1.83 mJ C. 3.65 mJ D. 7.31 mJ E. 5.48 mJ
A vertical spring system with a bob having mass M is set into motion with amplitude A. When the bob is pulled instead to move with amplitude 2A, the following can be concluded:
A. The period is half as large as before B. The period is unaffected C. The period is twice as large as before D. The period is 0.7 times as large as before E. The period is 1.4 times as large as before
An object with a nonzero rest mass moving at the speed of light would have
A. time pass at an infinitely fast rate. B. infinite apparent mass. C. no momentum. D. infinite volume.