What is the closest that extrasolar planets have been found to their stars?
A) nearer to their stars than Earth to the Sun
B) nearer to their stars than Saturn to the Sun
C) nearer to their stars than Mercury to our Sun
D) unknown: we do not know the distance with enough accuracy to say
C
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What are the properties of the neutral hydrogen gas that exists in the interstellar medium?
What will be an ideal response?
Consider a brick that is totally immersed in water, with the long edge of the brick vertical. The pressure on the brick is
A) the same on all surfaces of the brick. B) greatest on the face with largest area. C) greatest on the top of the brick. D) greatest on the sides of the brick. E) greatest on the bottom of the brick.
The lowest energy level in an atom is its __________
Fill in the blank(s) with correct word
Two cranes are lifting identical steel beams at the same time. One crane is putting out twice as much power as the other. Assuming friction is negligible, what can you conclude is happening to explain this difference?
a) The crane with double the power must be lifting its beam four times as fast. b) The crane with double the power must be lifting its beam twice as fast. c) The crane with double the power must be lifting its beam twice as slowly. d) The crane with double the power must be lifting its beam four times as slowly.