Suppose the barn shown here is 10 meters long and the pole is 11.5 meters long. What is the minimum velocity that the pole has to travel relative to the barn for someone standing in the barn to measure the pole's length to be 10 meters or less?
a. 1/4 of the speed of light.
b. 1/2 of the speed of light.
c. 80% of the speed of light.
d. The speed of light c.
e. 110% of the speed of light.
b
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The chief erosive agent now on the Moon is
A) lunar ice melting and refreezing in the polar regions. B) lava flows welling up in the mare. C) volcanic vents in the rugged highlands. D) the rain of micrometeorites chewing up the regolith. E) rain from cometary debris melting as it enters the Moon's atmosphere.
The movement of a pool ball, after being struck by a cue, is an example of
A) Newton's first law of motion. B) Newton's second law of motion. C) Newton's third law of motion. D) the universal law of gravitation. E) conservation of momentum.
As a pressurized aircraft gains altitude, the force acting on the boarding door due to the difference between the outside air pressure and the pressure inside the aircraft _____________ with height
Fill in the blank(s) with correct word
Electric current is measured in which SI units?
a) watts. b) joules. c) amperes. d) coulombs.