An ideal reversible refrigerator keeps its inside compartment at 9.0°C. What is the high temperature, Th, needed to give this refrigerator a coefficient of performance of 3.7?
A) 42°C B) 85°C C) 1052°C D) 11°C
B
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In what sense are telescopes "time machines" that allow us to study the formation and evolution of galaxies?
What will be an ideal response?
Solar winds headed in Earth's direction are deviated mainly by
A) the upper atmosphere. B) the troposphere. C) Earth's magnetic field. D) Earth's radiation belts.
This figure shows the motions of atoms (a) in a falling ball and (b) after the ball hits the ground. Why would you not expect the ball on the ground to suddenly move upward?
a. Because it is exceedingly unlikely that the velocities of the atoms would simultaneously reorder themselves to generally point upward. b. It would violate the first law of thermodynamics. c. Both a. and b.
Superconductivity is lost when a certain __________ is exceeded
Fill in the blank(s) with correct word