Dmitri places one end of a copper rod in a heat reservoir and the other end in a heat sink. By what factor is the rate of heat flow changed when the temperature difference between the reservoir and sink is tripled?
a. 0.33
b. 1/9
c. 3.0
d. 9.0
c
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What is the average power dissipation in an RLC series circuit with R = 10 ?, L = 0.1 H, C = 10 ?F when driven at resonance by a 100 V rms source?
a. 100 W b. 500 W c. 1000 W d. 2 kW e. 700 W
Naturally occurring uranium is mostly
A) 14U. B) 238U. C) 233U. D) 235U. E) good to eat.
Using monochromatic light of 410 nm wavelength, a single thin slit forms a diffraction pattern, with the first minimum at an angle of 40.0° from central maximum
The same slit, when illuminated by a new monochromatic light source, produces a diffraction pattern with the second minimum at a 60.0° angle from the central maximum. What is the wavelength of this new light? A) 276 nm B) 293 nm C) 309 nm D) 326 nm E) 342 nm
A steel lift column in a service station is a solid cylinder 4.0 m long and 0.20 m in diameter. Young's modulus for this steel is 20 × 1010 N/m2. By what distance does the column compress when a 5000-kg truck is on it?
A) 4.7 × 10-7 m B) 8.0 × 10-7 m C) 3.2 × 10-6 m D) 7.8 × 10-6 m E) 3.1 × 10-5 m