Assume a diatomic molecule can be considered to be two point masses separated by a distance r. The center of mass of the system is located a distance x from m1, equal to
a. m1r/(m1 + m2)
b. m2r/(m1 + m2)
c. (m1 + m2) r/m1
d. (m1 + m2) r/m2
e. r(m2/m1)
b
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The Greenhouse Effect works by trapping:
A) incoming ultraviolet radiation from the Sun. B) outgoing ultraviolet radiation from the Earth. C) incoming infrared radiation from the Sun. D) outgoing infrared radiation from the Earth. E) the heat from the Sun in Earth's atmosphere.
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 4 cm wide but 7 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time. b. the same distance up as before, but take a longer time. c. a smaller distance up, but take a shorter time. d. a greater distance up, but take a longer time. e. a greater distance up, but take the same time.
When a switch is closed, completing an LR series circuit, the time needed for the current to reach one half its maximum value is ____ time constants
a. 0.250 b. 0.500 c. 0.693 d. 1.00 e. 1.44
The gas, C3H8, is used in outside grills, and several moles of this gas will burn during an afternoon's grilling. What is the mass of one molecule of this gas?
a. 4.4 × 10^–23 g b. 7.3 × 10^–23 kg c. 7.3 × 10^–26 kg d. 8.8 × 10^–26 kg