Absolute zero is the temperature
A. of the freezing point of water.
B. on the coldest day recorded at Nome, Alaska.
C. at which an ideal gas would exert zero pressure.
D. of the freezing point of mercury.
E. of the boiling point of liquid helium.
Answer: C
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The removal of the carbon dioxide from the atmosphere is critical to Earth because:
A) an atmosphere rich in carbon dioxide can trap heat. B) carbon dioxide is transparent to infrared radiation. C) carbon dioxide is opaque to ultraviolet radiation. D) carbon dioxide reduces plants' ability to synthesize energy.
Two objects of the same size, but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the
A) lighter object. B) heavier object. C) Both hit at the same time. D) not enough information
Which of the following statements about novae is not true?
A) The word nova means "new star" and originally referred to stars that suddenly appeared in the sky, then disappeared again after a few weeks or months. B) When a star system undergoes a nova, it brightens considerably, but not as much as a star system undergoing a supernova. C) Our Sun will probably undergo at least one nova when it becomes a white dwarf about 5 billion years from now. D) A star system that undergoes a nova may have another nova sometime in the future. E) A nova involves fusion taking place on the surface of a white dwarf.
A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
A. +2.0 J B. +20 J C. ?2.0 J D. ?20 J E. +40 J