A 2.00 kg hollow sphere of radius 6.00 cm starts from rest and rolls without slipping down a 10.0 degree incline. If the length of the incline is 50.0 cm, then the velocity of the center of mass of the hollow sphere at the bottom of the incline is
A. 1.51 
B. 1.47
C. 1.22
D. 1.01
E. 1.95
D. 1.01
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Which of the following best describes how the Drake equation is useful?
A) It helps us understand what we need to know to determine the likelihood of finding other civilizations. B) It has allowed us to determine the number of civilizations in the Milky Way Galaxy. C) It allows us to calculate the masses of planets orbiting other stars. D) It tells us what wavelengths of light will be most useful to examine in the search for extraterrestrial intelligence.
Answer the following statement(s) true (T) or false (F)
1. The sun’s mass is about 1000 times that of Jupiter, and the radius of Jupiter’s orbit is about 1100 times the sun’s radius. The center of mass of the sun/Jupiter system is inside the sun. 2. Two stars, one with radius r and the other with radius 3r, orbit each other so that their centers of mass are 25r apart. Assume that the stars have the same uniform density. This system’s center of mass is inside the larger star. 3. Kepler’s 2nd law applies to hyperbolic orbits. 4. Kepler’s 3rd law applies to hyperbolic orbits.
The resolving power of a telescope is
a. a measure of the minimum angular separation that can be seen with the telescope. b. a measure of the maximum angular separation that can be seen with the telescope. c. a measure of the amount of light that the telescope can gather in one second. d. the separation between the objective and the image. e. a measure of how blurry object appear in the telescope.
Normally a small party balloon charged to several thousand volts will have a relatively small amount of
A) charge. B) energy. C) both of these D) neither of these