An ac series circuit has an impedance of 60 ? and a resistance of 30 ?. What is the power factor of this circuit?
A) 1.4 B) 0.50 C) 1.0 D) 0.71
B
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Latent Heats: When a sample of water at 0.0°C is cooled to -36.0°C and freezes in the process, 935,000 kJ of heat is liberated. What is the mass of this sample of water? For water LF = 334,000 J/kg, LV = 2.256 × 106 J/kg, and the specific heat of ice is 2050 J/kg ? C°.
A. 2290 kg B. 1145 kg C. 2800 kg D. 12,700 kg
If Burl carried Paul piggy-back while standing in the middle of a scaffold, the tensions in the two supporting ropes would
A) cancel to zero. B) be equal. C) be unequal. D) more easily support Burl and Paul.
An ideal monatomic gas undergoes a reversible expansion to 1.5 times its original volume. In which of these processes does the gas perform the most work?
A) at constant pressure B) if the pressure increases in proportion to the volume C) if the pressure decreases in proportion to the volume D) at constant temperature E) adiabatically
When air gains speed in sweeping across a rooftop its internal pressure is
A) reduced. B) unaffected. C) increased.