For luminosity classification, fat stars have skinny spectral lines
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Ideal monatomic gas A is composed of molecules with mass m while ideal monatomic gas B is composed of molecules with mass 4m. The average translational kinetic energies are the same if the ratio of the temperatures TA/TB is:
A. 1/4 B. 1/2 C. 1 D. 2 E. 4
To turn 50 grams of boiling water to steam requires
A) 50 calories. B) 500 calories C) 540 calories. D) more than 540 calories. E) none of the above
A 50.0-N box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. You observe that at one instant the box is sliding to the right at 1.75 m/s and that it stops in 2.25 s with uniform acceleration
What magnitude force does friction exert on this box? A) 3.97 N B) 8.93 N C) 38.9 N D) 50.0 N E) 490 N
Which of the following quantities is conserved for a planet orbiting a star in a circular orbit? Only the planet itself is to be taken as the system; the star is not included
a. Momentum and energy. b. Energy and angular momentum. c. Momentum and angular momentum. d. Momentum, angular momentum and energy. e. None of the above.