For life to have existed continually on the Earth for the past 4 billion years, the oceans must have been
A) completely liquid for this entire time
B) frozen for most of this time
C) partially liquid for most of this time
D) partially frozen for most of this time
C
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A block is at rest on a wooden ramp. The coefficient of static friction between the block and ramp is 0.35. What is the angle between the ramp and the horizontal direction when the box first begins to slide?
A. 17
B. 19
C. 29
D. 20
E. 22
Harry places a new air conditioner in the middle of his hot room, which when operating
A) cools the room. B) further warms the room. C) neither of these
The composition of the interstellar gas is very similar to the composition of our Sun.
Answer the following statement true (T) or false (F)
The twinkling of starlight and the focusing of images by lenses are both due to ________ of light
A) transmission B) refraction C) aberration D) reflection E) polarization