A gas-filled vertical cylinder, closed at the bottom end, is fitted at the top with a piston that can move freely. The mass of the piston is 10.0 kg, and the initial height of the piston above the bottom of the cylinder is 25 cm
A mass of 8.0 kg is placed on the piston. What is the resulting height of the piston, assuming that the temperature of the ideal gas is kept constant?
A) 12 cm
B) 13 cm
C) 14 cm
D) 15 cm
E) 16 cm
C
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In astronomy, an interferometer can be used to:
A) yield better seeing conditions with optical telescopes. B) decrease the effects of light pollution in getting darker sky backgrounds. C) improve the angular resolution of radio telescopes. D) increase the sensitivity of infrared telescopes to longer wavelengths. E) speed up the processing of CCD images.
During a single period, the distance traveled by a wave is
A) one-half wavelength. B) one wavelength. C) two wavelengths. D) more information is needed
When a typical open cluster forms, which type of stars are formed most often?
A) solar type stars of class G B) OB associations C) red giants D) low mass M type dwarfs E) white dwarfs
On this graph, the black curve represents actual temperature measurements, the red curve represents models of the climate that include human emissions of greenhouse gases, and the blue curve represents models of the climate that include only natural factors but do not include human emissions of greenhouse gases. What is the key message that can be read from this graph?
A) Models support the conclusion that human emissions are driving global warming. B) Different climate models give different predictions about how much global warming should be occurring. C) Climate models can successfully reproduce Earth's climate for the first half of the 20th century, but after that, they are unable to account for actual temperature data. D) Although some models support the idea that global warming is caused by human activity, other models do not and the cause therefore remains controversial.