The major product of the fusion of 4 protons in the Sun's core is a(n) ________ nucleus
Fill in the blank(s) with correct word
helium 4
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A straight wire 20 cm long, carrying a current of 4 A, is in a uniform magnetic field of 0.6 T. What is the force on the wire when it is at an angle of 30° with respect to the field?
A) 0.2 N B) 0.3 N C) 0.4 N D) 0.5 N E) 0.6 N
One of the most fundamental discoveries about the universe has been that it is expanding. "The universe is expanding" means
A) the cosmological horizon is growing with time. B) galaxies are growing with time. C) distances between most galaxies are getting larger. D) our estimate for the size of the universe has increased over the last century.
The frost line of the solar system was located approximately between
A) the Sun and the present-day orbit of Mercury. B) the present-day orbits of Mercury and Venus. C) the present-day orbits of Mars and Jupiter. D) the present-day orbits of Venus and Earth. E) the present-day orbits of Uranus and Neptune.
An ideal monatomic gas undergoes a reversible expansion to 1.5 times its original volume. In which of these processes does the gas have the largest loss of internal energy?
A) at constant pressure B) if the pressure increases in proportion to the volume C) if the pressure decreases in proportion to the volume D) at constant temperature E) adiabatically