A system performs 800 J of work while taking in 500 J of heat. What is the change in internal energy of the system?
A. not possible.
B. 300 J
C. -300 J
D. 1300 J
E. -1300 J
C. -300 J
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In the critical universe now proposed, the ratio of matter/energy is about:
A) 50:50. B) 27:73. C) 75:25. D) 10:90. E) 95:5.
Tidal locking is what makes the Moon rotate about its own axis at the same rate that it revolves around Earth
Using as a model of a moon two identical masses of mass m connected by a light rod, explain how the forces on the masses would tend to keep this satellite in a fixed orientation.
Thermodynamic Devices: During each cycle, a refrigerator removes 20.0 kJ of heat from the freezing compartment and ejects 24.0 kJ into a room.(a) How much work per cycle is required each cycle to run this refrigerator?(b) What is the coefficient of performance of this refrigerator?
Fill in the blank(s) with the appropriate word(s).
When the Sun ejects its outer layer into space to become a planetary nebula, most likely the
A) Earth will be ejected from the solar system B) Earth will be destroyed C) Earth's oceans will freeze solid D) Earth will experience a runaway greenhouse effect followed by the total loss of its atmosphere