50 g of lead (c = 0.11 kcal/kg ? °C) at 100°C is put into 75 g of water at 0°C. What is the final temperature of the mixture?
A) 2°C
B) 6.8°C
C) 13°C
D) 25°C
E) 50°C
B
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Which of the following telescopes must be used above Earth's atmosphere?
a. an optical telescope b. the VLBA telescope c. an X-ray telescope d. a radio telescope e. None of the other choices are correct.
Quasars were used to determine the size of the Local Supercluster
Indicate whether the statement is true or false
Valles Marineris on Mars is
A) about as long and deep as the Grand Canyon on the Earth B) much longer and deeper than the Grand Canyon on Earth C) much shorter and shallower than the Grand Canyon on Earth D) much longer but not as deep as the Grand Canyon on Earth
The surface of Venus is much hotter than the Earth because it
A) has no magnetic field B) has a very thick atmosphere of carbon dioxide C) has a much higher rate of volcanic activity D) is closer to the Sun