The discovered that the orbits of planets are ellipses.
What will be an ideal response?
kepler
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Three equal negative point charges are placed at three of the corners of a square of side d. What is the magnitude of the net electric field at the center of the square? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
What will be an ideal response?
What makes white-dwarf supernovae very good standard candles for distance measurements?
A) They are very bright, so they can be used to determine the distances to galaxies billions of light-years away. B) They should all have approximately the same luminosity. C) They occur so frequently that we can use them to measure the distances to virtually all galaxies. D) We have had several occur close to us in the Milky Way, so we have been able to determine their luminosities very accurately. E) both A and B
Temperature increases with altitude in the
A) troposphere. B) thermosphere. C) mesosphere. D) all of these
The ecliptic
A) occurs during a solar or lunar eclipse. B) is the average distance between the Sun and Earth. C) is the plane of Earth's orbit. D) refers to the gases from which our solar system formed.