A beam of light in air is incident on a glass slab at an angle of incidence ?i < 90°. After entering the glass slab, the beam of light
A)
does not change its path.
B)
follows the normal to the glass slab.
C)
bends away from the normal drawn at the point of contact.
D)
bends closer to the normal drawn at the point of contact.
D
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According to the principle of equivalence, gravity is equivalent to
A) acceleration. B) the state of free-fall. C) net force. D) energy. E) velocity.
A generator is designed to produce a maximum emf of 170 V while rotating at 3200 rpm. The coils of the generator are circular with diameter 7.5 cm. Assuming the magnetic field in the generator is 0.075 T, what is the number of loops needed in the generator coil?
A. 160 B. 1530 C. 6120 D. 4810 E. 25
If three vectors add to zero, they must all have equal magnitudes
A) True B) False
What evidence suggests that the Milky Way contains dark matter?
A) We observe clouds of atomic hydrogen far from the galactic center orbiting the galaxy at unexpectedly high speeds, higher speeds than they would have if they felt only the gravitational attraction from objects that we can see. B) We see many lanes of dark material blocking out the light of stars behind them along the band of the Milky Way. C) We see many dark voids between the stars in the halo of the Milky Way. D) When we observe in different wavelengths, such as infrared or radio, we see objects that don't appear in visible-light observations. E) When we look at the galactic center, we are able to observe a large black hole that is composed of dark matter.