If the volume of an object doubles with no change in mass, its density would be
A) half.
B) double.
C) unchanged.
Answer: A
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Which of the following can act like a long-term "thermostat" for the Earth's average temperature?
A) heat stored in the Earth's magnetosphere B) the carbon dioxide cycle C) radioactive elements trapped in the Earth's mantle D) heat stored in the Earth's liquid core
Which air mass has greater air pressure?
A) warm air B) cold air C) adiabatic air D) expanding air
Suppose the half-life of an isotope is 2 days. You purchase 10 grams of the isotope, but it was produced in a laboratory 4 days before it was delivered to you
How much of this isotope will you have 3 days after it was delivered to you? A) more than 2.5 grams but less than 5 grams B) 2.5 grams C) 1.25 grams D) more than 1.25 grams but less than 2.5 grams E) less than 1.25 grams
A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat of combustion of coal is 3.3 × 107 J/kg
The steam that drives the turbines is at a temperature of 300°C, and the exhaust water is at 37°C. (a) What is the overall efficiency of the plant for generating electric power? (b) What is the Carnot efficiency? (c) How much thermal energy is exhausted each day?