A lithium-sodium






Physics & Space Science

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When one kilogram of uranium undergoes nuclear fission,

A) the total amount of rest-mass is conserved. B) the total amount of energy is conserved. C) Both of the above. D) Neither of the above.

Physics & Space Science

What kind of object do we think lies in the center of the Milky Way Galaxy?

A) a black hole of about 4 million solar masses B) a gigantic x-ray binary system C) a dense cluster of young, hot stars D) an enormous collection of dark matter, explaining why we detect no light at all from the galactic center

Physics & Space Science

The expanding Universe theory:

contends that galaxies are moving away from Earth and from each other at fantastic speed. is supported by the fact that all galaxies exhibit a red shift. raises the question of when the expansion began. resulted in the formulation of the big bang theory. All of the above are true.

Physics & Space Science

A solid cylinder of radius R = 1.0 m and mass 10 kg rotates about its axis. When its angular velocity is 10 rad/s, its angular momentum (in kg?m2/s) is

A. 50. B. 20. C. 40. D. 25. E. 70.

Physics & Space Science