To outside observers at rest, the overall sizes of objects traveling at relativistic speeds are
A) larger.
B) smaller.
C) the same size.
Answer: B
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What is the likely reason that we cannot find any examples of the first generation stars?
A) The first generation stars are too faint to be visible now. B) The first generation stars formed such a long time ago that the light from them has not yet had time to reach us. C) The first generation stars were all very massive and exploded as supernova. D) The first generation stars formed with only H and He and therefore have no spectral features. E) We do not know how the first generation stars were formed.
A -6.5-µC point charge is 8.0 cm from a -17-µC charge. What is the electric energy density at the point midway between them? (?0 = 8.85 × 10-12 C2/N ? m2, k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
What will be an ideal response?
True or False? It’s possible for a slowing car to have a positive acceleration
1.False 2.True
If the terminals of a battery with zero internal resistance are connected across two identical resistors in series, the total power delivered by the battery is 8.00 W. If the same battery is connected across the same resistors in parallel, what is the total power delivered by the battery?
1.16.0 W 2.32.0 W 3.2.00 W 4.4.00 W 5.none of those answers