If gravity between the Sun and Earth suddenly vanished, Earth would move in
A) a curved path.
B) an outward spiral path.
C) an inward spiral path.
D) a straight-line path.
Answer: D
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In the grapefruit model of the solar system, it would take a few minutes to walk from the Sun to the inner edge of the Kuiper Belt (Pluto)
Indicate whether the statement is true or false
At which of the following temperatures would one liter of water weigh the most?
a. 2°C b. 4°C c. 8°C d. 90°C e. It would weigh the same at all these temperatures.
What two quantities did Edwin Hubble plot against each other to discover the expansion of the Universe?
A) velocity and distance B) luminosity and distance C) velocity and temperature D) luminosity and temperature E) age and distance
If Burl carried Paul piggy-back while standing in the middle of a scaffold, the tensions in the two supporting ropes would
A) cancel to zero. B) be equal. C) be unequal. D) more easily support Burl and Paul.