Do the constellations visible in the sky at a particular time of night (say 9 pm) follow a seasonal pattern?
a. No, the same constellations are visible at 9 pm on any clear night of the year.
b. No. As the year progresses, the constellations visible at 9 pm are the same but their shapes change.
c. Yes, at 9 pm during a clearwinter night ALL of the constellations you can see are different from the ones that appear at the same time during a summer night.
d. Yes, at 9 pm during a summer night most of the constellations you can see are different from those you can see on a winter night. However, there are some constellations that are visible all year long.
D
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A. 2 light-years. B. 5 light-years. C. 5 parsecs. D. 2 parsecs.
A concave mirror has a focal length F. An object that is placed in front of the mirror has an image that
A. can be upright or inverted. B. is always upright. C. is always inverted. D. depends on the magnitude of F.
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What will be an ideal response?
A spaceship traveling at 0.50c away from Earth launches a secondary rocket in the forward direction at 0.50c relative to the spaceship. As measured by Earthlings, how fast is the secondary rocket moving away from Earth?
A) 0.90c B) 0.50c C) 0.80c D) 0.70c E) c