Perhaps as much as 95% of the matter in superclusters is dark matter
Indicate whether the statement is true or false
TRUE
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The softening point for the soda-lime glass in Figure 9.3 is approximately _________K.
Fill in the blank(s) with the appropriate word(s).
Suppose the distance to a star was doubled but everything else about the star stayed the same. What would happen to the star's apparent brightness in our sky?
A) It would decrease by a factor of 2. B) It would decrease by a factor of 4. C) It would increase by a factor of 2. D) It would increase by a factor of 4. E) It would remain the same.
If the specific heat of water were lower than it is, ponds in the cold of winter would be
A) more likely to freeze. B) less likely to freeze. C) neither more nor less likely to freeze.
Which of these represents an example of simple harmonic motion?
(i) a bouncing ball (ii) a marble rolling back and forth in a concave bowl (iii) a tree branch vibrating (iv) someone walking back and forth across a room, dozens of times
1.all of them 2.(i) and (iv) 3.(ii) and (iii) 4.(i) and (iii)