Four people are sitting at the lettered positions on the rim of a merry-go-round shown below that is slowly turning clockwise. You throw a fairly massive ball horizontally to one of these people, who catches it. To which person should you throw the ball so that catching it most effectively increases the merry-go-round’s rotation rate? 
A. A
B. B
C. C
D. D
C. C
Physics & Space Science
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The second stage of planetary evolution is _____
A) cratering and giant basin formation B) ozone layer formation C) differentiation D) slow surface evolution
Physics & Space Science
A star with a parallax of 1 second of arc is at a distance of ________ by definition
Fill in the blank(s) with correct word
Physics & Space Science
An 800-N man stands at rest with his weight evenly distributed on two bathroom scales. The reading on each scale is
A) 200 N. B) 400 N. C) 800 N. D) 1600 N. E) none of the above
Physics & Space Science
A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0 s, assuming negligible air resistance?
A) 9.8 m/s upward B) 9.8 m/s downward C) 0 m/s D) 19.6 m/s downward
Physics & Space Science