According to our theory of solar system formation, why does the Sun rotate slowly today?
A) The Sun once rotated much faster, but it transferred angular momentum to charged particles caught in its magnetic field and then blew the particles away with its strong solar wind.
B) The Sun once rotated much faster, but it transferred angular momentum to the planets during the parts of their orbits where they come closest to the Sun.
C) The Sun once rotated much faster, but it lost angular momentum due to internal friction.
D) The Sun once rotated much faster, but it lost angular momentum because everything slows down with time.
E) The Sun was born rotating slowly because the solar nebula had very little angular momentum.
A) The Sun once rotated much faster, but it transferred angular momentum to charged particles caught in its magnetic field and then blew the particles away with its strong solar wind.
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What technique does a radio telescope use to focus incoming light?
A. dispersion B. refraction C. reflection D. diffraction
A parallel-plate capacitor stores charge Q. The capacitor is then disconnected from its voltage source, and the space between the plates is filled with a dielectric of constant ? = 2 . What is the relationship between the stored energies of the capacitor, where PEi is the initial stored energy, and PEf is the stored energy after the dielectric is inserted?
a. PEf = 0.25PEi b. PEf = 0.5PEi c. PEf = PEi d. PEf = 2PEi
A boat floating in a large pool is loaded with wood blocks. The water level at the pool's edge is marked with a red line. The blocks are now thrown overboard and float outside the boat. When the water becomes calm again,
A. the red line is slightly higher than the water level. B. the red line is still at the water level. C. the red line is slightly lower than the water level.
Twenty milliseconds is 0.020 s
Indicate whether the statement is true or false