Suppose you have a camera attached to a telescope, and you want to record an image of a faint galaxy. Which of the following will help the most?
A) a lot of pixels and a long exposure time
B) a lot of pixels and a short exposure time
C) a small number of pixels and a long exposure time
D) a small number of pixels and a short exposure time
A) a lot of pixels and a long exposure time
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Early astronomers picture the Earth as stationary, with the ________ spinning, moving the stars along with it
Fill in the blank(s) with correct word
A river 100 m wide flows due south at 1 m/s. A boat that goes 1 m/s relative to the water leaves the west bank. To land at a point due east of its starting point, the boat must be pointed
A) northeast. B) east. C) southeast. D) nowhere–it can't be done.
On a Hertzsprung-Russell diagram, where would we find stars that are cool and dim?
A) upper right B) lower right C) upper left D) lower left
A proton falls through a potential drop of 400 V. How much is the change of potential energy of this proton in falling through this potential drop?
A) 6.4 × 10-16 J B) -6.4 × 10-16 J C) 17 × 10-16 J D) -4000 J E) 4000 J