A voltage DV is applied across the ends of a Nichrome heater wire having a cross-sectional area A and length L. The same voltage is applied across the ends of a second Nichrome heater wire having a cross-sectional area A and length 2L. Which wire gets hotter?
1.The shorter wire does.
2.The longer wire does.
3.More information is needed.
1
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Why are stars no longer forming in the galactic halo?
A) Frequent supernovae blew all the halo gas out into intergalactic space. B) There was never star formation in the halo; its stars were ejected from the disk. C) Only low-mass stars formed in the halo, so there were no stellar winds or supernovae to recycle gas. D) The cold molecular gas required for star formation is in the galactic disk.
While the gondola is rising at a speed of 2.0 m/s, a passenger in a balloon-supported gondola throws a small ball down at a speed of 5.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
A. 2.0 m/s, up. B. 3.0 m/s, down. C. 3.0 m/s, up. D. 5.0 m/s, down. E. 12.8 m/s, down.
You see a lightning flash and half a second later hear a loud blast of thunder. How far away did the lightning hit?
a. about a mile c. a tenth of a mile b. half a mile d. none of the above
The separation between Africa and the Arabian peninsula is a(n) ____________________ valley
Fill in the blank(s) with correct word