A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket, a light suddenly flashes. To an observer at rest in the rocket
A) the light will reach the front of the rocket at the same instant that it reaches the back of the rocket.
B) the light will reach the front of the rocket before it reaches the back of the rocket.
C) the light will reach the front of the rocket after it reaches the back of the rocket.
A
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If the masses of two planets doubles and the distance between them reduces by half, the force between them would be
A) unchanged. B) half as much. C) twice as much. D) four times as much. E) none of the above
A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere that is insulated from ground. It is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance
After the rod is separated, the rod A) is repelled by the sphere. B) is attracted to the sphere. C) feels no force due to the sphere.
The angular momentum of a rotating body is conserved when
A. when the body has a constant angular acceleration. B. the shape of the body does not change. C. no net force acts on the body. D. no net torque acts on the body.
Two pipes are smoothly connected together without leaks. One has a diameter of 3 cm and the other has a diameter of 5 cm. Water flows through the pipes. In which pipe is the flow speed the greatest?
1.in the pipe that the water flows through first (the "upstream" pipe) 2.in the 3 cm pipe 3.in the 5 cm pipe 4.in neither, the flow rate is the same in both pipes