Branch lengths in the tree of life are a measure of the
A) rate of evolution between different species
B) size difference between species
C) life expectancy difference between species
D) amount of genetic difference between different species
D
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In a collision between two objects having unequal masses, how does magnitude of the impulse imparted to the lighter object by the heavier one compare with the magnitude of the impulse imparted to the heavier object by the lighter one?
A) The lighter object receives a larger impulse. B) The heavier object receives a larger impulse. C) Both objects receive the same impulse. D) The answer depends on the ratio of the masses. E) The answer depends on the ratio of the speeds.
When throwing a ball straight up, which of the following is true about its velocity and acceleration at the highest point in its path?
A. both v = 0 and a = 0 B. v ? 0, a = 0 C. v = 0, a ? 0 D. v ? 0, a ? 0 E. not really sure