A 120-mH inductor is in series with a 20-? resistor and a variable capacitor that can range from 0.110 ?F to 0.400 ?F
(a) What is the range of possible resonance frequencies? (b) If the power supply is a 24-V rms source, what rms current flows at resonance?
(a) 0.726 kHz to 1.39 kHz (b) 1.20 A
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Conduction: Two metal rods, one silver and the other copper, are both immersed at one end in a steam chamber at a temperature of 100°C. The other end of each one is in an ice water bath at 0°C. The rods are 5.0 cm long and have a square cross-section that is 2.0 cm on a side. No heat is exchanged between the rods and the surroundings, except at the ends. How much total heat flows through the two rods each minute? The thermal conductivity of silver is 417 W/m ? K, and that of copper is 395 W/m ? K.
A. 20 kJ B. 39 kJ C. 47 kJ D. 49 kJ E. 11 kJ
The total energy emitted by the brightest nova explosions is about:
A) 1,000 Suns. B) 50,000 Suns. C) a million Suns. D) a billion Suns. E) a trillion Suns.
You whirl a 2-kg body attached to a 1-meter cord around your head in a nearly horizontal circle with a speed of 4 m/s. The tension in the cord is
a. 2 N. b. 4 N. c. 8 N. d. 16 N. e. 32 N.
How do colors differ when viewed under incandescent light and fluorescent light?