When a girl swings in a tire swing, the tangential acceleration in the rope
A. is the greatest at the highest point of the motion.
B. is the greatest at the lowest point of the motion.
C. is the greatest at a point neither highest nor lowest.
D. is constant.
B. is the greatest at the lowest point of the motion.
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If an object of mass 20 kg on earth is sent to the moon it will have a mass of
A. 10 kg. B. 20 kg. C. 0.0 kg. D. 4.0 kg.
Based on galactic rotation curves and cluster dynamics, we think dark matter:
A) is a minor component of the entire mass of the universe. B) is best detected from the X-rays it produces in the intergalactic medium. C) will have no effect on the fate of the universe. D) comprises over 90% of the entire mass of the universe. E) will doom the universe to collapse, overcoming the redshifts we now observe.
One reason for building telescopes on mountain tops is that they improve seeing by reducing the amount of air above the observer
Indicate whether the statement is true or false
A player kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory
A) both the velocity and the acceleration of the soccer ball are zero. B) neither the ball's velocity nor its acceleration are zero. C) the ball's acceleration is zero but its velocity is not zero. D) the ball's acceleration points upward. E) the ball's velocity points downward.