Being the ideal engine, the maximum COP of a Carnot cycle operated in reverse as a refrigerator is
A) (Th/Tc)(1 – Tc/Th)-1.
B) 100.
C) (1 – Tc/Th)-1.
D) (Tc/Th) ? (1 – Tc/Th)-1.
D
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A) baseball. B) pea. C) car. D) basketball.
Find the magnetic energy stored in the air gap between two very large magnetic pole pieces, one North, one South, each with an area of 100 cm2 . Assume the 0.05 T magnetic field is uniform within the 2-cm gap
Basalt, a dense congealed lava rock rich in iron, is the primary material in the Moon's
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A) 7.72 × 1026 B) 641 C) 441 D) 3.86 × 1026 E) 2.65 × 1026