Which of these statements is true?
a. Aristotle believed that the speed at which objects fall depends on their weight (and he was right).
b. Aristotle believed that the speed at which objects fall depends on the medium they fall through (and he was wrong).
c. Aristotle believed that a falling object was not trying to reach a goal.
d. Aristotle believed that the speed at which objects fall depends on both their weight and the medium they fall through (and he was partly right).
e. Aristotle believed that how fast objects fall depends on both their weight and their surrounding medium (and he was right).
d
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A 120 kg mass is blown apart into an 80 kg piece and a 40 kg piece. After the blast, the two masses are moving apart with a relative velocity of 60 m/s. The total kinetic energy after the explosion is
A. 21 kJ. B. 35 kJ. C. 48 kJ. D. 56 kJ. E. 82 kJ.
Between a pair of equal and opposite charges, field lines are
A) directed from positive to negative. B) more concentrated closer to the charges. C) vectors, with patterns that stem from the inverse-square law. D) all of the above E) none of the above
A bit of matter that enters Earth's atmosphere and survives to reach the ground is called
a. a meteor. b. a meteoroid. c. a meteorite. d. a minor planet. e. an asteroid.
Which graph shows an object moving with a constant non-zero velocity?
GRAPH A
GRAPH B
GRAPH C
