If a wave has a frequency of 15 Hz, it has a period of
a. 1/15 s.
b. 3.9 s.
c. 225 s.
d. 15 s.
a
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When a spinning ice skater pulls in his arms, he spins faster because
A) his angular momentum must be conserved, so reducing his radius must increase his speed of rotation. B) there is less friction with the air. C) there is less friction with the ice. D) there exists an unbalanced reaction force.
Which of the following best explains why nuclear fusion requires bringing nuclei extremely close together?
A) Nuclei are attracted to each other by the electromagnetic force, but this force is only strong enough to make nuclei stick when they are very close together. B) Fusion can proceed only by the proton-proton chain, and therefore requires that protons come close enough together to be linked up into a chain. C) Nuclei normally repel because they are all positively charged and can be made to stick only when brought close enough for the strong force to take hold. D) Nuclei have to be very hot in order to fuse, and the only way to get them hot is to bring them close together.
A bar magnet is held stationary while a circular loop of wire is moved toward the magnet at constant velocity at position A as in the figure
The loop passes over the magnet’s center at position B and moves away from the magnet at position C. Viewing the loop from the left as indicated in the figure, for which position is the induced current zero?
a.
Position A
b.
Position B
c.
Position C
d.
The induced current is never zero.
You are building a compound microscope with an objective lens of focal length 0.60 cm and an eyepiece lens of focal length 5.0 cm. You mount the lenses 18 cm apart. What is the maximum magnification of your microscope?
a. 5 b. 10 c. 75 d. 150 e. 18