A battery supplies 6.0 mA to a 12-? resistor for 1.5 h. How much electric energy does this resistor dissipate in this time?
What will be an ideal response?
2.3 J
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A torque of 12 N ? m is exerted on a solid, uniform disk of radius 0.50 m. If the disk accelerates at what is the mass of the disk?
A) 60 kg B) 45 kg C) 30 kg D) 15 kg
Temperature variation of different parts of a person's body can be detected by analyzing the emission pattern of which type of electromagnetic radiation?
a. microwave b. infrared c. ultraviolet d. x-rays
A 14-cm diameter champagne bottle rests on its side on top of a frictionless horizontal table. Suddenly, the cork pops and the bottle slides backward, covering a distance of 22cm in 0.44s
If the mass of the bottle is 500 times the mass of the cork, find the distance from the original position that the cork will land on the table. Neglect air resistance and assume that the cork is very small compared to the bottle. A) 3,000 cm B) 60 m C) 85 m D) 8.5 cm
What is the expression for efficiency () in terms of the work W done by the system and the heat Q added to it?
a. = WQ b. = Q/W c. = Q + W d. = Q + 273K e. = W/Q