Astronomers have found that the expansion of the Universe is ________.
A. speeding up
B. changing randomly
C. constant
D. slowing down
Answer: A
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Latent Heats: A beaker of negligible heat capacity contains 456 g of ice at -25.0°C. A lab technician begins to supply heat to the container at the rate of 1000 J/min. How long after starting will the ice begin to melt, assuming all of the ice has the same temperature? The specific heat of ice is 2090 J/kg ? K and the latent heat of fusion of water is 33.5 × 104 J/kg.
Fill in the blank(s) with the appropriate word(s).
As compared to Jack, Jill does twice the work in half the time. Jill's power output is
A) the same as Jack's power output. B) one-fourth as much as Jack's power output. C) one-half as much as Jack's power output. D) twice Jack's power output. E) four times Jack's power output.
If the handle of a tuning fork is held solidly against a table, its resulting sound is
1) louder, 2) softer, 3) doesn't change, and as a result of this, the length of time the fork keeps vibrating 4) increases. 5) decreases. 6) doesn't change.
If you are in the Moon's umbral shadow, then you are witnessing
A) nighttime. B) some kind of lunar eclipse. C) a total solar eclipse. D) a partial solar eclipse. E) a total lunar eclipse.