You observe a star in the disk of the Milky Way, and you want to plot the star on an H-R diagram. You will need to determine all of the following, except the
A) spectral type of the star.
B) distance to the star.
C) apparent brightness of the star in our sky.
D) rotation rate of the star.
D
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An asteroid, of mass
kg is observed to have an escape speed equal to a typical person’s speed attained by jumping off, 3.0m/s. What is its radius?
A. 6.3 km B. 2.1 km C. 1.0 km D. 0.5 km
What are comets made of?
A. mostly oxygen and uranium B. mostly iron, rock, and hydrogen C. mostly hydrogen and helium D. mostly ice and frozen gases E. None of these choices is correct.
What is the focal length of the combined lenses with individual powers of 8.0 diopters and 4.0 diopters?
A) 8.0 cm B) 5.6 cm C) 6.0 cm D) 8.3 cm E) 4.0 cm
A magnifying glass has a convex lens of focal length 15 cm. At what distance from a postage stamp should you hold this lens to get a magnification of +2.0?