Water that is denser than surrounding water sinks. With respect to the densities of deeper water, how far does it sink?
A) until it encounters water of the same density
B) until it encounters water that is less dense
C) until it encounters water that is denser
D) None of the above.
Answer: A
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The natural background radiation we personally encounter is
A) a trace amount. B) about a quarter. C) about half. D) more than half.
The cosmic background radiation has a low temperature today because
A. it has gotten so far from the Sun. B. it was created with a low temperature. C. the Universe has expanded, and expansion causes cooling. D. all the stars that were heating it have burned out. E. it is rich in heavy elements that absorb radiation very strongly.
What would the formula be for the following stick model?
A) C4H10 B) C3H3 C) C3H6 D) C3H8 E) C4H8
The speed of light is a relativistically invariant quantity
a. True b. False Indicate whether the statement is true or false