The space between the stars is known to contain
A. a perfect vacuum.
B. a large quantity of dust but no gas at all.
C. a variable amount of gas but no dust at all.
D. both gas (atomic or molecular) and dust.
Answer: D
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A bolt of lightning strikes the ground 200 m from a 100-turn coil oriented vertically and with the plane of the coil pointing toward the lightning strike. The radius of the coil is 0.800 m and the current in the lightning bolt falls from 6.02 × 106 A to zero in 10.5 ?s. What is the voltage induced in the coil over this time period? [A question for future electrical engineers: is there any way
to get lightning to strike repeatedly at the same point?]
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Which of the following charge distributions has the lowest potential energy?
The blue light from the sky has been polarized by:
a. selective absorption. b. reflection. c. double refraction. d. scattering.
When an object is placed 118 cm from a thin concave lens, its image is found to be 59 cm from the lens. The lens is removed, and replaced by a thin convex lens whose focal length has the same magnitude as the diverging lens
This second lens is at the original position of the first lens. Where is the image of the object now?