Consider some material that has been cooled until it has become a superconductor. If it is cooled even further its resistance will:

a. increase.
b. decrease.
c. stay constant and non-zero.
d. None of the above.


d

Physics & Space Science

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If two stars are the same temperature, how can one be more luminous than the other?

A. It can be closer. B. It can be a different spectral type. C. It can have stronger magnetic fields. D. It can have a larger radius. E. It can have a larger reaction rate in the core.

Physics & Space Science

How many moles are there in 2.00 kg of copper? The atomic weight of copper is 63.5 g/mol and its density is 8.90 g/cm3

A) 31.5 B) 15.3 C) 53.1 D) 51.3

Physics & Space Science

What happens during the apparent retrograde motion of a planet?

A) The planet appears to move eastward with respect to the stars over a period of many nights. B) The planet moves through constellations that are not part of the zodiac. C) The planet rises in the west and sets in the east. D) The planet moves backward in its orbit around the Sun. E) The planet moves backward through the sky.

Physics & Space Science

If you float a piece of wood in a container half-full of water that rests on a weighing scale, the weight reading on the scale will

A) decrease. B) remain unchanged. C) increase.

Physics & Space Science