Two lights are 1000 ns apart along a stretch of railway track. In the ground frame, the west light flashes 600 ns before the east light flashes. Could these flashes be simultaneous in the frame of a train moving along the track at a certain speed (that is less than the speed of light)?
A. Yes, if the train is moving east at the correct speed.
B. Yes, if the train is moving west at the correct speed.
C. Yes, if the train observer happens to be at the right distances from the lights when receiving their flashes.
D. No, the flashes cannot be simultaneous in any frame.
A. Yes, if the train is moving east at the correct speed.
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If a star has an apparent magnitude of 8 and an absolute magnitude of 6 it is
A. much farther than 10 parsecs away. B. slightly farther than 10 parsecs away. C. much closer than 10 parsecs away. D. slightly closer than 10 parsecs away. E. exactly 10 parsecs away.
If the composition of the upper atmosphere were altered to permit a greater amount of terrestrial radiation to escape, Earth would be
A) cooler. B) warmer. C) quite unaffected. D) none of the above
If the Earth were to be moved to where Venus is today,
A) the oceans would evaporate, blocking light from the Sun and causing global temperatures to fall B) carbon dioxide would be released from the oceans leading to higher temperatures but liquid water could still exist on the surface C) the oceans would evaporate slightly producing a slightly warmer, more humid planet D) the oceans would evaporate and carbonate rocks would decompose producing a runaway greenhouse effect much more severe than the one that exists on Venus today
You observe two helium balloons floating next to each other at the ends of strings secured to a table. The facing surfaces of the balloons are separated by 1-2 cm. You blow through the opening between the balloons. What happens to the balloons?
1.They move toward each other. 2.They move away from each other. 3.They are unaffected.