The birth of a thunderstorm occurs when
A) warm, humid air rises in a stable environment.
B) warm, humid air rises in an unstable environment.
C) a cold front encounters a warm front.
D) a maritime polar air mass encounters a maritime tropical air mass.
Answer: B
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A fixed amount of ideal gas is held in a rigid container that expands negligibly when heated. At 20°C the gas pressure is p. If we add enough heat to increase the temperature from 20°C to 40°C, the pressure will be
A) impossible to determine since we do not know the number of moles of gas in the container. B) greater than 2p. C) less than 2p. D) equal to 2p. E) impossible to determine since we do not know the volume of gas in the container.
Explain the appearance of the Sun's spectrum, as noted by Fraunhofer
What will be an ideal response?
A solid wooden door, 90 cm wide by 2.0 m tall, has a mass of 35 kg. It is open and at rest. A small 500-g ball is thrown perpendicular to the door with a speed of 20 m/s and hits the door 60 cm from the hinged side, causing it to begin turning
The ball rebounds along the same line with a speed of 16.0 m/s relative to the ground. How much mechanical energy is converted to internal energy during this collision? A) 30 J B) 16 J C) 15 J D) 13 J E) 4.8 J
Volcanoes that explode violently tend to have magmas of
a. high temperature and low silica content. b. high temperature and high silica content. c. low temperature and low silica content. d. low temperature and high silica content.