How much heat energy must be removed from 150 g of oxygen at 22°C to liquefy it at -183°C? (The specific heat of oxygen gas is 0.218 cal/g•°C, and its heat of vaporization is 50.9 cal/g.)
a. 14,300 cal
c. 4320 cal
b. 9560 cal
d. 2160 cal
A
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The Chandrasekhar limit tells us that
a. accretion disks can grow hot through friction. b. neutron stars of more than 3 solar masses are not stable. c. white dwarfs more massive than 1.4 solar masses are not stable. d. stars cannot travel through space too fast e. stars with a mass less than 0.5 solar masses will not go through helium flash.
The Algol paradox is explained by considering
a. the degenerate nature of the hydrogen on the surface of the white dwarf. b. synchrotron radiation c. the rate of expansion of the shock wave inside the supernova. d. the rotation rate of a neutron star. e. mass transfer between the two stars in a binary system.
Energy and Momentum: Two simple pendulums of equal length l = 0.45 m are suspended from the same point. The pendulum bobs are small solid steel spheres. The first bob is drawn back to make a 35° angle with the vertical, while the other one is left hanging at rest. If the first bob has a mass of 0.25 kg and the second has a mass of 0.54 kg, how high will the second bob rise above its initial position when struck elastically by the first bob after it is released?
A. 3.3 cm B. 2.7 cm C. 3.9 cm D. 4.4 cm
State which element is oxidized and which is reduced in the reaction Al + 3F2 ? 2AlF3