What is the solar wind?
A) a stream of charged particles flowing outward from the surface of the Sun
B) the uppermost layer of the Sun, which lies just above the corona
C) the strong wind that blows sunspots around on the surface of the Sun
D) the wind that causes huge arcs of gas to rise above the Sun's surface
A) a stream of charged particles flowing outward from the surface of the Sun
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Which would experience a greater buoyant force when placed in a beaker of water, a one-inch cube of steel or a one-inch cube of cork?
a. The cork because it floats. b. The steel because it is completely submerged. c. They experience the same buoyant force because they have the same volume. d. The cork because its volume is larger. e. The steel because its volume is larger.
A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the fundamental frequency?
a. 316 Hz b. 632 Hz c. 158 Hz d. 215 Hz e. 79 Hz
If Europa turns out to have a subsurface ocean which is a 100 km deep or more, how much water would this correspond to, compared to the amount of water in the Earth's oceans?
A) about the same B) roughly twice as much C) about ten times as much D) roughly half as much
The average value of 
t for a complete cycle is
A. 1. B. 0. C. 0.707. D. 0.500. E. 0.250.