When we look at the Andromeda Galaxy tonight though our telescope, we see this galaxy
a) as it was just after the big bang
b) as it was 3.2 years ago as it was when the light left this galaxy
c) as it is now because light travel instantaneously
d) as it was 2.5 million years ago when the light that we are seeing today left that galaxy
Ans: d) as it was 2.5 million years ago when the light that we are seeing today left that galaxy
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A) 5.0 m B) 10. m C) 19. m D) 31. m E) 0.20 m
When you purchase a water pipe in a hardware store, water is not included. When you purchase copper wire, electrons
A) must be supplied by you, just as water in a water pipe. B) already exist in the wire. C) may fall out, which is why wires are insulated. D) none of the above
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An object 10.0 cm in height is placed 37.0 cm in front of a concave mirror of focal length 18.5 cm. What is the height of the image?
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