A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is positive. The sphere is
a.
rotating clockwise and slowing down.
b.
rotating counterclockwise and slowing down.
c.
rotating clockwise and speeding up.
d.
rotating counterclockwise and speeding up.
e.
first rotating counterclockwise and then clockwise.
b
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Tycho's universe was the same as the Copernican universe except that
a. Earth did not move. b. the sun did not move. c. the moon orbited the sun. d. the orbits were elliptical with the sun at one focus. e. the orbits followed uniform circular motion.
A ball is thrown upward and caught when it returns. Compared with its initial speed and in the presence of air resistance, the speed with which it is caught is
A) more. B) less. C) the same. D) need more information.
What is the surface temperature of a star, given that its radiation peak occurs at a frequency of 1.86 × 1015 Hz?
A) 17,000 K B) 14,500 K C) 19,000 K D) 20,400 K E) 18,000 K
Consider the two systems below, labeled A and B
A B
Which gas has the higher pressure?