Reactance: What is the rms current through a 2.50-mH coil due to a 110-V rms, 60-Hz source?
A. 0.94 A
B. 2.5 A
C. 104 A
D. 117 A
Answer: D
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A stone is thrown horizontally from the top of a cliff. One second after leaving your hand it drops a vertical distance of
A) 5 m. B) 10 m. C) 15 m.
Latent Heats: How much heat must be removed from 456 g of water at 25.0°C to change it into ice at -10.0°C? The specific heat of ice is 2090 J/kg ? K, the latent heat of fusion of water is 33.5 × 104 J/kg, and the specific heat of water is 4186 J/kg ? K.
A. 105 kJ B. 153 kJ C. 57.3 kJ D. 47.7 kJ E. 210 kJ
The phenomenon of beats is a result of sound
A) refraction. B) reflection. C) interference. D) all of the above E) none of the above
A lighted candle is 10 m away from a wall. A concave mirror is being used to project an image of the candle onto the wall. If the image is going to be 3.0 times the size of the object, how far should the mirror be from the wall?
A) 6.5 m B) 7.0 m C) 6.0 m D) 5.5 m E) 15 m