If you see a rainbow near the time of sunset, where in the sky will the rainbow be?
a. overhead
b. toward the eastern horizon
c. toward the western horizon
d. toward the northern horizon
e. toward the southern horizon
b
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A 0.40-kg mass, attached to the end of a 0.75-m string, is whirled around in a circular horizontal path. If the maximum tension that the string can withstand is 400 N, then what maximum speed can the mass have if the string is not to break?
a. 370 m/s c. 19 m/s b. 27 m/s d. 29 m/s
A planar loop consisting of four turns of wire, each of which encloses 250 cm2, is oriented perpendicularly to a magnetic field that increases uniformly in magnitude from 10 mT to 25 mT in a time of 5.0 ms. What is the resulting induced current in the coil if the resistance of the coil is 5.0 W?
a. 48 mA c. 12 mA b. 0.24 mA d. 60 mA
What are black dwarfs?
A) The lowest mass main sequence stars B) The end result of massive star evolution C) Objects that are not quite massive enough to be stars D) Pulsars that have slowed down and stopped spinning E) Cooled off white dwarfs that no longer glow visibly
On a clear day, the sky appears to be more blue toward the zenith (overhead) than it does toward the horizon. This occurs because
A) the atmosphere is denser higher up than it is at the earth's surface. B) the temperature of the upper atmosphere is higher than it is at the earth's surface. C) the sunlight travels over a longer path at the horizon, resulting in more absorption. D) the atmosphere is more reddish over the ocean.