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 positive, its angular velocity is positive, and its angular acceleration is negative. 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 clockwise and then counterclockwise.
b
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What makes up the dark colors of the lunar lowlands?
a. sedimentary rock b. anorthosite c. andesite d. basalt e. iron
What evidence suggests that some small galaxies in our Local Group have undergone two or more starbursts in the past?
A) We observe several small galaxies currently undergoing massive star formation. B) We see small galaxies in which many stars have one age and many others have another age that is billions of years older. C) We see evidence that small galaxies in our Local Group have experienced several collisions in the past. D) We see evidence that several small galaxies were shot out of larger galaxies in our Local Group during a period of starburst activity.
The attraction between unlike substances is called
A) adhesion. B) cohesion. C) depends on the substances.
A functional group is
a. exemplified by the R in ROH. b. a vertical column in the periodic table. c. exemplified by the COOH in RCOOH. d. a horizontal row in the periodic table.