Collisions between which pairs of objects is likely to be most nearly elastic?
A. A steel ball and a baseball
B. Two steel balls
C. A steel ball and a cotton ball
D. Two baseballs
Answer: B
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An 80-kg football player travels to the right at 8 m/s and a 120-kg player on the opposite team travels to the left at 4.0 m/s. The total momentum is
A. 240 kg m/s to the left. B. 160 kg m/s to the right. C. zero. D. 1120 kg m/s to the right. E. 160 kg m/s to the left.
The text states that luminous matter in the Milky Way seems to be much like the tip of an iceberg. This refers to the idea that ________
A) black holes are much more interesting than ordinary stars that give off light B) luminous matter emits white light, much like the light reflected from icebergs C) the luminous matter of the Milky Way is essentially floating on the surface of a great sea of dark matter D) dark matter represents much more mass and extends much further from the galactic center than the visible stars of the Milky Way
What is the proper abbreviation for ‘kilohertz?'
a. kh b. khz c. Khz d. KHz e. kHz
What would be the greatest effect of the finite size of molecules on the ideal gas law?
A) At low densities, the pressure would be less than that predicted by the ideal gas law. B) At high densities, the pressure would be less than that predicted by the ideal gas law. C) At high densities, the pressure would be greater than that predicted by the ideal gas law. D) At low densities, the pressure would be higher than that predicted by the ideal gas law. E) There is no effect.