Superconductivity is destroyed in by a high magnetic field because the magnetic field
(a) Heats the superconductor.
(b) Induces current in the superconductor.
(c) Rotates Cooper pair electron spins into the same direction.
(d) Alters the orbits of electrons on the atoms.
(c) Rotates Cooper pair electron spins into the same direction.
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At lower elevations the air is generally
A) warm and heavy. B) warm and light. C) cool and heavy. D) cool and light.
A spring stretches by 21.0 cm when a 135 N object is attached. What is the weight of a fish that would stretch the spring by 31 cm?
A) 199 N B) 91.0 N C) 145 N D) 279 N
Fusion of degenerate hydrogen on the surface of a white dwarf causes temperatures to reach millions of degrees and the density tens of thousands the density of water releasing enough energy to blow the surface layers, resulting in a(n) _______________
Fill in the blank(s) with correct word
An object is released from rest when it is a height h above the surface of a planet of mass M and radius R. What is the speed of the object just before striking the surface of the planet? Neglect any air resistance. Let h = 4.0 × 106 m, R = 5.0 × 106 m, and M = 4.0 × 1024 kg.
A. 7.8 km/s B. 3.5 km/s C. 5.4 km/s D. 6.9 km/s E. 4.8 km/s