the length of time a star spends in the main sequence stage depends on its
What will be an ideal response?
mass
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Hot, low-density gas can be detected in galactic clusters through X-ray emission. The gas is important in understanding dark matter because ____
a. dark matter is responsible for heating the gas b. dark matter must make the cluster massive enough to hold on to the hot gas c. the gas may be the source of dark matter d. the gas is clumped in empty places between galaxies where there is more dark matter e. the gas is produced by dark matter
Matter Waves: What is the wavelength of the matter wave associated with a 0.50-kg ball moving at 25 m/s? (h = 6.626 × 10-34 J ? s)
A. 3.5 × 10-35 m B. 5.3 × 10-35 m C. 3.5 × 10-33 m D. 5.3 × 10-33 m
A light bulb is in front of a converging lens, creating a well-focused image of the light bulb on the screen on the opposite side of the lens. If the light is moved farther from the lens, how can the screen be adjusted to keep the image in focus?
A. The screen should be moved further from the lens. B. The screen should be made larger, but in the same place. C. The screen should be moved closer to the lens. D. No changes need to be made to the screen.
Suppose that an object is moving with constant acceleration. Which of the following is an accurate statement concerning its motion?
A) In equal times its speed increases by equal amounts. B) In equal times its velocity changes by equal amounts. C) In equal times it moves equal distances.