A fatal flaw with Ptolemy's model is its inability to predict the observed phases of
A) the Sun during an eclipse.
B) Mars and Jupiter.
C) the Moon in its monthly cycle.
D) Jupiter and Saturn.
E) Mercury and Venus.
E
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A speedy tortoise can run with a velocity of 10.0 cm/s and a hare can run 20.0 times as fast. In a race, they both start at the same time, but the hare stops to rest for 2.00 minutes. The tortoise wins by a shell (20.0 cm). What was the length of the race?
The temperature of an object from which no heat energy can be extracted is
a. 0? F b. 0? C c. 0? K d. 100? K e. 100? C
A player catches a ball. Consider the action force to be the ball against the player's glove. The reaction is the
A) player's grip on the glove. B) force of the glove on the ball. C) friction of the ground against the player's shoes. D) muscular effort in the player's arms. E) none of the above
Which of the following has the largest momentum relative to Earth?
A) a tightrope walker crossing Niagara Falls B) a pickup truck speeding along a highway C) a Mack truck parked in a lot D) a dog running down the street