When an electron collides with a positron producing a pair of high gamma rays, we call this process
A) pair production
B) matter obliteration
C) photodisintegration
D) annihilation
D
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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
The New Horizons space probe passed through the Pluto system in
A) 2008. B) 2012. C) 2015. D) 2016.
A mercury thermometer has a glass bulb of interior volume 0.100 cm3 at 10°C. The glass capillary tube above the bulb has an inner cross-sectional area of 0.012 mm2. The coefficient of volume expansion of mercury is 1.8 × 10-4 K-1
If the expansion of the glass is negligible, how much will the mercury rise in the capillary tube when the temperature rises from 5°C to 35°C if the bulb was full at 5°C? A) 0.45 mm B) 4.5 mm C) 45 mm D) 45 cm
The ultimate fate of our Sun is to
A) become a white dwarf that will slowly cool with time. B) explode in a supernova. C) become a rapidly spinning neutron star. D) become a black hole.