The energy required to accelerate a ship the mass of an ocean liner to a cruising speed of 10% of the speed of light is approximately
A) one million times the Earth's current annual energy usage
B) one hundred times the Earth's current annual energy usage
C) equal to the Earth's current annual energy usage
D) ten times the Earth's current annual energy usage
B
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An object is placed exactly halfway between the Earth and the Moon. The object will fall toward the
A) Earth. B) Moon. C) neither
A juggler throws two balls to the same height so that one is at the halfway point going up when the other is at the halfway point coming down. At that point:
a. Their velocities and accelerations are equal. b. Their velocities are equal but their accelerations are equal and opposite. c. Their accelerations are equal but their velocities are equal and opposite. d. Their velocities and accelerations are both equal and opposite. e. Their velocities are equal to their accelerations.
Photosynthetic life existing on a planet farther from the Sun than the Earth would most likely be
A) smaller, less efficient at collecting solar radiation or have a faster metabolism than photosynthetic life on Earth B) identical to photosynthetic life on Earth C) larger, more efficient at collecting solar radiation or have a slower metabolism than photosynthetic life on Earth D) impossible
Masses of the planets are easiest to determine if
A) they are terrestrial and the extra size of the planet's disk can be measured. B) they are jovian and their oblateness can be found. C) they have natural satellites whose motions can be precisely measured. D) they are dense and easily deflect the path of passing spacecraft. E) they move rapidly and their periods are easily measured.