A heat engine absorbs 64 kcal of heat each cycle and exhausts 42 kcal. (a) Calculate the efficiency each cycle. (b) Calculate the work done each cycle
What will be an ideal response?
(a) 34%
(b) 22 kcal
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Superconductivity is lost when a certain __________ is exceeded
Fill in the blank(s) with correct word
What do we mean by the singularity of a black hole?
A) There are no binary black holes—each one is isolated. B) An object can become a black hole only once, and a black hole cannot evolve into anything else. C) It is the center of the black hole, a place of infinite density where the known laws of physics cannot describe the conditions. D) It is the edge of the black hole, where one could leave the observable universe. E) It is the "point of no return" of the black hole; anything closer than this point will not be able to escape the gravitational force of the black hole.
The Appalachian Mountains in the eastern United States are examples of ______________ mountains
Fill in the blank(s) with correct word
In an experiment involving the apparatus shown in figure Q4.1b, suppose that after shining light on the cathode long enough that the voltmeter settles down to a fixed value, we suddenly cut off the light. If the voltmeter is truly ideal, what happens to the value displayed? 
A. It immediately drops to zero. B. It slowly decays to zero. C. It remains fixed. D. It does something else. (Describe what.)