Which has greater kinetic energy: a car traveling at 30 km/h or another car of half the mass traveling at 60 km/h?
A) The 30-km/h car
B) The 60-km/h car
C) both have the same kinetic energy
Answer: B
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How does Earth's varying distance from the Sun affect our seasons?
A) It doesn't—Earth's orbital distance plays no significant role in the seasons.
B) It causes the seasons to be more extreme than they would be if the Earth's distance from the Sun were always the same.
C) It makes summer warmer in the Northern Hemisphere than in the Southern Hemisphere.
D) It is responsible for the fact that the seasons are opposite in the Northern and Southern hemispheres.
Stan argues that momentum cannot be conserved when a collision is not a head-on collision. Rachel insists it is conserved because each body receives an impulse of equal magnitude. Rachel is correct because
a. each body exerts an equal and opposite force on the other during the collision. b. the forces act during equal time intervals. c. the law of conservation of momentum for an isolated system is a vector equation. d. of all of the above. e. of only (a) and (b) above.
Which of these statements is correct?
a. Like charges repel each other; unlike charges attract each other. b. Like charges attract each other; unlike charges repel each other. c. All charges attract each other. d. All charges repel each other. e. Two electrons, or two protons, will repel each other because they have like masses.
Which clock measures the shorter time interval between the synchronization and comparison events (or do both measure the same time)?
A. Clock A B. Clock B C. Both D. Neither