Recently, superconducting wire was made using magnesium diboride (S. Jin, H. Mavoori, C. Bower, and R. B. Van Dover, "High critical currents in iron-clad superconducting MgB2 wires," Nature 411, 563 (2001))
This is assumed to hold the promise of cheap efficient energy transmission. Explain how this might be true.
First, this material is basically a metal and relatively easy to work, to make wires
of. Second, as indicated, it is a superconductor. That means that its resistance vanishes at
low enough temperatures. Low fabrication costs and low losses could lead to lower
transmission costs.
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It is the distribution of ________ atoms in the spiral arms that is measured with 21-cm radio maps
Fill in the blank(s) with correct word
A ball is thrown straight upward from ground level with a speed of How much time passes before the ball strikes the ground if we disregard air resistance?
A) 3.7 s B) 1.8 s C) 1.1 s D) 0.6 s
You push on a block on frictionless ice with a force of 8 N, causing it to accelerate at 2 m/s2 . The mass of the block is __________
Fill in the blank(s) with correct word
If a Carnot heat engine is run in reverse, it becomes
A. a heat engine with the smallest possible efficiency. B. a refrigerator. C. an engine that has a negative efficiency. D. nothing. It can't be run in reverse because to do so would violate the second law of thermodynamics.