Carnot Engine: An ideal Carnot engine is operated between a hot and a cold reservoir. The temperature difference between the two reservoirs is 284°C. If the efficiency of this ideal engine is 24.0%, find the temperature of the cold reservoir in degrees Celsius.
Fill in the blank(s) with the appropriate word(s).
626°C
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Suppose that two objects collide. Which of the following things is not necessarily the same both before and after the collision? (In other words, which quantity is not conserved according to the laws of physics?)
A) the total temperature of the objects B) the total momentum of the objects C) the total angular momentum of the objects D) the total energy of the objects
Light of a given wavelength is used to illuminate the surface of a metal, however, no photoelectrons are emitted. In order to cause electrons to be ejected from the surface of this metal you should
A) use light of a longer wavelength. B) use light of a shorter wavelength. C) use light of the same wavelength but increase its intensity. D) use light of the same wavelength but decrease its intensity.
The four general categories of "energy resources" from which we can obtain useful energy services are: fossil, nuclear, renewable [i.e., alternative], and
A) hydroelectric. B) breeder reactors. C) biomass. D) chemical. E) energy efficiency.
One fundamental difference between a particle and its antiparticle is the
A. number of quarks contained in each particle. B. charge, if the particle has a charge. C. spin. D. mass.