A car travels at a steady 40.0 m/s around a horizontal curve of radius 200 m. What is the minimum coefficient of static friction between the road and the car's tires that will allow the car to travel at this speed without sliding?
A) 1.23 B) 0.952 C) 0.816 D) 0.662 E) 0.736
C
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Why do pulsars "pulse"?
A. Their surface expands and contracts rapidly, causing changes in brightness. B. They have extremely fast rotation rates. C. Their rotation axis is misaligned with their magnetic field axis. D. They have extremely strong magnetic fields.
Galileo said that if you rolled a ball along a level surface it would
A) slow down due to its natural tendency to come to rest. B) keep rolling without slowing down if no friction acted upon it. C) roll as long as its inertia nudged it along. D) eventually roll in the opposite direction.
When is an elevator a reasonably good inertial reference frame?
A. Never, under any circumstances. B. Always, since it is attached to the surface of the earth. C. It is good except when it is changing speed. D. Other conditions (describe).
Two players are enjoying a steady volley in a game of ping-pong, in which the motion of the ball is repeated regularly. Is the motion of the ball simple harmonic motion?
What will be an ideal response?