The polarization of light passing though the dust grains shows that:
A) the dust grains are elongated in shape.
B) the dust grains are aligned by a weak interstellar magnetic field.
C) the dust grains are chiefly made of iron.
D) Both A and B are correct.
E) All of the above are correct.
D
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If the same impulse is applied to a ping-pong ball and a baseball, the change in the ping-pong ball's momentum will be ________ the baseball's.
What will be an ideal response?
How much work would a child do while pulling a 12-kg wagon a distance of exerting a force?
A) 95 J B) 52 J C) 67 J D) 109 J
The unit of inductance, the henry, is equivalent to:
a. J/C. c. V•s/A. b. V/m. d. none of the units given.
The volume of water that flows past a given point in a channel during a specified time is called
A) load. B) gradient. C) discharge. D) runoff.