Which of the following best describes the image from a plane mirror?
a. virtual and magnification greater than one
b. real and magnification less than one
c. virtual and magnification equal to one
d. real and magnification equal to one
c
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The Sun crosses the celestial equator going northward at the point called the _____
A) summer solstice B) autumnal equinox C) winter solstice D) vernal equinox
Which event would you expect to be most closely associated with regions of active star formation?
a. Type Ia supernovae b. Type Ib supernovae c. Type II supernovae d. novae e. planetary nebulae
Compare the atmospheres of Mars and Venus
A) Both are made of hydrogen and helium, like the jovians. B) Like Earth, nitrogen is the chief atmospheric gas. C) Both are chiefly carbon dioxide, but at Mars it can freeze as dry ice. D) Mars is rich in oxygen, like ours, accounting for its red surface. E) Both are too hot for water to now exist as a liquid at the surface.
Why don't the two forces in Newton's third law cancel each other?
a. Because they have different magnitudes. b. Because they act in the same direction. c. Because they act in different directions. d. Because they are different kinds of forces. e. Because they act on two different objects.