When a sample of water at 0.0°C is cooled to –36.0°C and freezes in the process, 935,000 kJ of heat is liberated. What is the mass of this sample of water?
For water LF = 334,000 J/kg, LV = 2.256 × 106 J/kg, and the specific heat of ice is 2050 J/kg ? C°.
A) 2290 kg B) 12,700 kg C) 2800 kg D) 1145 kg
A
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You observe the peak brightnesses of two white dwarf supernovae. Supernova A is only 1/4 as bright as Supernova B. What can you say about their relative distances?
A) Supernova A is twice as far away as Supernova B. B) Supernova A is 4 times as far away as Supernova B. C) Supernova B is 4 times as far away as Supernova A. D) Supernova B is twice as far away as Supernova A. E) We can't say anything about their relative distances because we do not have enough information.
Massive stars:
A) use their fuel sparingly. B) die after only a few million years. C) are unable to generate energy by nuclear fusion. D) do not evolve rapidly if their hydrogen is exhausted.
Energy Conservation With Conservative Forces: A small but dense 2.0-kg stone is attached to one end of a very light rod that is 1.2 m long. The other end of the rod is attached to a frictionless pivot. The rod is raised until it is vertical, with the stone above the pivot. The rod is released and the stone moves in a vertical circle with no air resistance. What is the tension in the rod as the stone moves through the bottom of the circle?
A. 20 N B. 40 N C. 60 N D. 80 N E. 100 N