One way to heat a gas is to compress it. A gas at 1.00 atm at 25.0°C is compressed to one tenth of its original volume, and it reaches 30.0 atm pressure. What is its new temperature?
a. 1500 K
c. 1192°C
b. 621°C
d. 919°C
B
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Which of the following show evidence of ancient river beds?
A) the Moon B) Mercury C) Venus D) Mars E) all of the above
A weight of 200 N is hung from a spring with a spring constant of 2500 N/m and lowered slowly. How much will the spring stretch?
A) 4.00 cm B) 6.00 cm C) 8.00 cm D) 10.0 cm E) 12.0 cm
The Big Bang theory is supported by two major lines of evidence that alternative models have not successfully explained. What are they?
A) (1 ) The theory correctly predicts that the universe should be expanding; (2 ) the theory predicts the existence of and the specific characteristics of the observed cosmic microwave background. B) (1 ) The theory predicts the episode of inflation that we think occurred in the early universe; (2 ) the theory predicts the existence of large quantities of dark matter. C) (1 ) The theory correctly predicts that the universe should be expanding; (2 ) the theory correctly predicts the observed ratio of spiral to elliptical galaxies in the universe. D) (1 ) The theory predicts the existence of and the specific characteristics of the observed cosmic microwave background; (2 ) the theory correctly predicts the observed overall chemical composition of the universe.
To melt 50 g of 0°C ice requires
A) 25 calories. B) 50 calories. C) 80 calories. D) none of the above