A tetherball is attached to a pole with a 2.0-m rope. It is circling at 0.20 rev/s. As the rope wraps around the pole, it shortens. How long is the rope when the ball is moving at 6.0 m/s?
a. 1.8 m b. 0.83 m
c. 1.2 m d. 1.0 m
b
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In simple harmonic motion, the magnitude of the acceleration is:
A. constant B. proportional to the displacement C. inversely proportional to the displacement D. greatest when the velocity is greatest E. never greater than g
Two cars go around a banked curve at the proper speed for the banking angle. One car has tires with excellent traction, while the other car has bald slippery tires
Which of these cars is more likely to slide on the pavement as it goes around the curve? A) the car with the new tires B) the car with the bald tires C) Neither car will slide. D) It depends on if the pavement is wet or dry.
Compared with the period of satellites in close Earth orbit, the period of satellites orbiting far from Earth is
A) shorter. B) the same. C) longer. D) need more information
In a model airplane, the propeller is a significant part of the total mass. A model airplane is flying on a level path, with its propeller rotating clockwise as seen facing the airplane
At a preset time, a signal causes the plane to lower its tail flaps and it goes into a nose-down attitude. When this happens, the nose of the plane also swings towards the right. Explain why this happens.