Why don't low-mass stars have the CNO cycle occurring in their cores?
A) The CNO cycle makes elements heavier than carbon, nitrogen, and oxygen.
B) They don't have enough carbon, nitrogen, and oxygen.
C) Their core temperatures are too low.
C) Their core temperatures are too low.
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A charged particle is moving in a magnetic field. What is the direction of the force on the particle due to the magnetic field?
a) in the direction of the magnetic field b) in the direction opposite to which the particle is moving c) in the direction that is perpendicular to both the magnetic field and the velocity d) in the same plane as the magnetic field and the velocity, but not in either of those two directions e) in the direction of motion
On a cold day, a heat pump absorbs heat from the outside air at 14°F (?10°C) and transfers it into a home at a temperature of 86°F (30°C). Determine the maximum COP of the heat pump.
A. 0.2 B. 4.4 C. 0.5 D. 7.6 E. 6.7
The positron was first predicted by
A) Einstein. B) Planck. C) Elvis Presley. D) Dirac. E) Heisenberg.
Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is open,
a.
bulb 1 is glowing; bulb 2 is dark.
b.
bulb 2 is glowing; bulb 1 is dark.
c.
both bulbs glow equally brightly.
d.
both bulbs glow one half as brightly as they do with the switch closed.
e.
both bulbs are dark.