Kepler's 3rd law says T2 /r3 = K. What does the constant K depend upon?
A) period
B) frequency
C) size
D) mass
E) temperature
D
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A long solenoid with closely spaced turns carries electric current. Each turn of wire exerts:
1.an attractive force on the next adjacent turn. 2.a repulsive force on the next adjacent turn. 3.zero force on the next adjacent turn. 4.either an attractive or a repulsive force on the next turn, depending on the direction of current in the solenoid.
A key piece of evidence that leads astronomers to conclude that most galaxies include a supermassive black hole in the center is that ____
a. high-speed disks of gas are observed in the central parsecs of other galaxies b. streamers of gas from stars that have been torn apart are detected in most galactic centers c. stars near the center of other galaxies are orbiting more rapidly than expected d. the mass of all galaxies is much more than expected based on the visible material in the galaxy e. the disks of all spiral galaxies rotate more quickly than Kepler's laws predict
Harlow Shapley concluded that the Sun was not in the center of the Milky Way Galaxy by
A) looking at the shape of the "milky band" across the sky. B) mapping the distribution of stars in the galaxy. C) mapping the distribution of globular clusters in the galaxy. D) mapping the distribution of gas clouds in the spiral arms. E) looking at other nearby spiral galaxies.
Which of the following is the reason for the leap years?
A) precession of Earth's axis B) the tilt of Earth's axis C) the combined effect of the rotation of Earth and its orbit about the Sun D) Earth year being a non-integer number of Earth days E) the non-circular orbit of Earth around the Sun