What type of galaxies do astronomers believe to be the most common?
a. Elliptical
b. Spiral
c. Irregular
d. Astronomers have no idea which type of galaxy is more common.
A
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Which of these statements is true?
a. a battery produces ac and a generator produces dc b. a battery and a generator produce ac c. a battery and a generator produce dc d. a battery produces dc and a generator produces ac
An ideal monatomic gas cools from 455.0 K to 405.0 K at constant volume as 831 J of energy is removed from it. How many moles of gas are in the sample? The ideal gas constant is R = 8.314 J/mol ? K
A) 2.50 mol B) 2.15 mol C) 1.50 mol D) 1.33 mol E) 0.725 mol
Under what condition can a force act on an object and yet do no work on that object?
A) If the net force on the object is zero. B) If the force operates at constant (unchanging) power. C) If the object does not move. D) If the object moves with no acceleration. E) Nonsense--any force on an object must do work on that object.
After an elastic collision of two balls, the kinetic energies of the two balls are measured to be 12J and 24J. What can be said about the kinetic energy of the two balls before the collision?
a. nothing—not enough information is given b. the balls had the same energies, 12J and 24J respectively c. the total kinetic energy of the two balls was 36J d. none of the above