Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. If there is no air resistance, when they hit the ground
A) both will have the same kinetic energy.
B) the heavier one will have twice the kinetic energy of the lighter one.
C) the heavier one will have four times the kinetic energy of the lighter one.
D) the heavier one will have half the kinetic energy of the lighter one.
E) the heavier one will have one-fourth the kinetic energy of the lighter one.
B
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Which of the following is NOT a possible explanation for dark energy?
A: quintessence, a fifth substance to the universe that varies in time. B: cosmological constant. C: gravity leaking out to dimensions besides the three spatial dimensions. D: the speed of light changing dramatically with time. E: all of the above.
Ordinary matter contains only the following quarks.
A. Strange B. Bottom C. Down D. Charm
If a ball at the end of a string is whirled in a vertical circle at constant speed, the tension will be
A. the same throughout the motion. B. greatest at a point where the string is instantaneously parallel to the ground. C. greatest at the lowest point in the motion. D. greatest at the highest point in the motion.
As the ball is going downwards, the velocity points __________ and the acceleration points __________
Fill in the blank(s) with correct word