As the temperature difference between its reservoirs increases, the COP of a refrigerator
A. gets larger.
B. gets smaller.
C. does not change.
B. gets smaller.
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A charged capacitor is connected to an ideal inductor. At time t = 0, the charge on the capacitor is equal to 6.00 ?C
At time t = 2.00 ms the charge on the capacitor is zero for the first time. What is the amplitude of the current at that same instant? A) 0.780 mA B) 1.19 mA C) 2.38 mA D) 4.71 mA E) 1.53 mA
In Figure 7.4, the time for the fraction of residual strain in iron to drop to 0.6 at 400°C is 137 minutes, and at 450°C it is 15 minutes.
(a) Calculate the activation enthalpy for the recovery of cold work in iron. (b) Comment on the magnitude of the activation enthalpy for recovery in comparison to the activation enthalpy for vacancy diffusion in iron, and justify your result.
_____ are circular bulges on Venus up to 1600 mi in diameter bordered by fractures, volcanoes, and lava flows
A) Coronae B) Maria C) Breccias D) Anorthosites
A 5.00 gram bullet has a velocity of 300 m/s. It strikes a block of wood and penetrates to a distance of 2.00 cm. The average force of the block of wood on the bullet is
A. 9,340 N. B. 11,250 N. C. 15,200 N. D. 19,500 N. E. 21,400 N.