Which of the following statements is correct?
a. For a nearsighted person, the near point is always located closer than 25 cm from the eye and the corrective lens is diverging.
b. For a nearsighted person, the near point is always located closer than infinity from the eye and the corrective lens is converging.
c. For a farsighted person, the near point is always located farther than 1 m from the eye and the corrective lens is diverging.
d. For a farsighted person, the near point is always located farther than 25 cm from the eye and the corrective lens is converging.
d
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Suppose that a comet goes around the sun in an elliptical orbit such that the comet at the farthest point in its orbit is 3 times as far from the sun as it is when it is at its closest point. How many times stronger is the gravitational force on the comet due to the sun when it is at its closest point than when it is at its farthest?
A. 
is the same at both positions.
B. 
times stronger
C. 3 times stronger
D. 9 times stronger
E. 27 times stronger
F. The answer depends on the relative masses of the comet and the sun.
A bird sitting on the limb of a tree is moving about 30 km/s with respect to the Sun. If the bird takes 1 second to drop down to a worm below, the worm would be 30 km downrange from the bird when it reached the ground
This faulty reasoning is best countered with Newton's A) law of inertia. B) law of gravity. C) laws of motion. D) none of the above
A pool ball moving at 3 m/s collides head-on with an identical pool ball that's initially at rest. Just after the collision, the second ball moves away at 2 m/s while the first ball
A) moves at 3 m/s in a direction opposite to the second ball. B) continues moving at 3 m/s in the same direction. C) is at rest. D) moves at 1 m/s in the same direction as the second ball. E) moves at 1 m/s in a direction opposite to the second ball.
Rita accelerates a 0.40-kg ball from rest to 12 m/s during the 0.15 s in which her foot is in contact with the ball. What average force does she apply to the ball during the kick?
a. 48 N c. 24 N b. 32 N d. 64 N