The angular magnification of a magnifying glass is largest when the image is at
A) the near point of the eye.
B) the far point of the eye.
C) infinity.
D) the focal point of the lens.
E) The magnification depends on the magnifying glass lens, not where the person puts his eye.
A
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On an H-R diagram, stellar masses
A) can be determined for main-sequence stars but not for other types of stars. B) are greatest in the lower left and least in the upper right. C) decrease from upper left to lower right. D) are impossible to determine.
For water to have been stable on Mars in the past,
A) temperature must have been higher and the atmospheric pressure lower B) temperature must have been lower and the atmospheric pressure higher C) both the temperature and the atmospheric pressure must have been higher D) both the temperature and the atmospheric pressure must have been lower
A ball is allowed to drop from rest. If the upward direction is positive, then after 2 seconds its velocity will be
A. 9.8 m/s. B. -9.8 m/s. C. -19.6 m/s. D. 19.6 m/s.
What do we mean by a protogalactic cloud?
A) a cloud of hydrogen and helium that contracts to become a galaxy B) a term once used historically to refer to any galaxy C) a cloud-like halo that surrounds the disks of spiral galaxies D) a cloud of gas that was once a galaxy