Jet-shaped regions of radio and optical emission have been observed in

a. quasars.
b. radio galaxies.
c. the 3-Kelvin radiation.
d. quasars and radio galaxies.


d

Physics & Space Science

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The latitude of the Earth's North Pole is

180 degrees. 90 degrees. 12 hours. 0 degrees.

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A refrigerator

A) produces cold. B) causes internal energy to disappear. C) transfers internal energy from inside to outside. D) transfers heat into cold. E) none of the above

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As one stretches a metal wire, which condition is reached first?

A) the breaking point B) the proportional limit C) the elastic limit

Physics & Space Science

Calories of the food type are equal to which of the following?

a. 4.186 J c. 1 BTU b. 4186 J d. 1054 J

Physics & Space Science