The greater the temperature difference between input and output reservoirs of a heat engine, the
A) greater the efficiency.
B) smaller the efficiency.
C) both of the above
D) none of the above
Answer: A
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The rapid fluctuations of quasars show that the energy emitting portions of these objects must be very small
a. True b. False Indicate whether the statement is true or false
Under what circumstances can differentiation occur in a planet?
A) The planet must have a rocky surface. B) The planet must be made of both metal and rock. C) The planet must have an atmosphere. D) The planet must be geologically active, that is, have volcanoes, planetquakes, and erosion from weather. E) The planet must have a molten interior.
A metal blade (length = 80 cm) spins at a constant rate of 10 radians/s about a pivot at one end. A uniform magnetic field of 2.0 mT is directed at an angle of 30° with the plane of the rotation. What is the magnitude of the potential difference between the two ends of the blade?
A. 5.5 mV B. 6.4 mV C. 3.2 mV D. 11 mV E. 13 mV
What is the essential reason that all perpetual motion machines fail?
a. Perpetual motion machines must create energy in order to do useful work, and energy cannot be created. b. Perpetual motion machines must at least preserve all the energy in a system, and some is always lost. c. Perpetual motion machines run on gasoline, and gasoline is not a renewable resource. d. A perpetual motion machine necessarily removes heat from a single-temperature environment. e. Perpetual motion machines have to contend with friction, which destroys energy.