An ideal Carnot engine operates between reservoirs having temperatures of 125°C and -20°C. Each cycle the heat expelled by this engine is used to melt 30.0 g of ice at 0.00°C
The heat of fusion of water is 3.34 × 105 J/kg and the heat of vaporization of water is 2.25 × 106 J/kg.
(a) How much work does this engine do each cycle?
(b) How much heat per cycle does this engine absorb at the hot reservoir?
(a) 5740 J (b) 15,800 J
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When a particle and antiparticle meet, they are said to annihilate each other. What does this mean?
a. They explode into tiny fragments. b. They are destroyed, and turned into an equivalent amount of energy. c. They merge and simply disappear. d. none of the above
Doubling the magnetic field in a proton synchrotron changes the maximum kinetic energy of the protons by what amount?
A. It is quadrupled. B. It is doubled. C. It remains the same. D. it is halved E. It is quartered.
Given 10 kWh of electricity and assuming no losses, how much work, in joules, could be done?
Two in-phase loudspeakers are 3.00 m apart. They emit sound with a frequency of 490 Hz
A microphone is placed half-way between the speakers and then moved along the line joining the two speakers until the first point of constructive interference is found. At what distance from that midpoint is that first point? The speed of sound in air is 343 m/s. A) 0.175 m B) 0.350 m C) 0.500 m D) 0.700 m E) There is no point in that line where constructive interference occurs.