What is one relationship of superconductors to magnets?

a. Superconductors draw in their own magnetic fields and thus attract magnets.
b. Superconductors affect nearby magnetic fields.
c. Superconductors expel their own magnetic fields and thus repel magnets.
d. Superconductors have no more relation to magnetic fields than ordinary conductors.
e. Superconductors can be used to create magnetic monopoles.


c

Physics & Space Science

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Ultraviolet radiation from a star:

A) gets almost completely absorbed before it reaches Earth's surface. B) has a wavelength that is longer than the visible light emitted by the star. C) has a wavelength that is shorter than the X-rays emitted by the star. D) reaches most of Earth's surface through atmospheric windows.

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Distilled water at 75ºF is suddenly exposed to oxygen gas at 75ºF. Determine the time before the oxygen concentration in the water is 0.1% by mass at a point 0.05 inches below the surface of the distilled water.

What will be an ideal response?

Physics & Space Science

Increasing the temperature of 1 gram of ice-cold water to the temperature of boiling water requires

A) 80 calories. B) 100 calories. C) 540 calories. D) none of the above

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Near the surface of the planet, the Earth's magnetic field is about 0.50 × 10^?4 T. How much energy is stored in 1.0 m3 of the atmosphere because of this field?

Physics & Space Science