A bucket filled with water has a mass of 20.0 kg and is attached to a rope, which in turn, is wound around a 0.050-m radius cylinder at the top of a well. What torque does the weight of water and bucket produce on the cylinder if the cylinder is not permitted to rotate? (g = 9.80 m/s2)
a. 19.6 N·m b. 9.8 N·m
c. 1.00 N·m d. 400 N·m
e. 196 N·m
b
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An electric circuit consists of a resistor connected across the terminals of an ac generator. How does the power dissipated in the resistor change as the frequency in the generator decreases?
A) It decreases. B) It increases. C) It does not change. D) It increases or decreases depending on the sign of the phase angle.
The Rankine temperature scale has Fahrenheit degrees and a zero point at absolute zero. What is the Fahrenheit temperature of 62 Rankine?
a. –397.7 °F b. 111.6 °F c. 211.2 °F d. –238.7 °F
A small bulb is rated at 7.5 W when operated at 125 V. Its resistance (in ohms) is
a. 0.45. b. 7.5. c. 17. d. 940. e. 2 100.
A relativistic proton has a momentum of 1.0 × 10-17 kg • m/s and a rest energy of 0.15 nJ. What is the kinetic energy of this proton? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 1.3 pJ B) 2.5 pJ C) 1.6 pJ D) 3.0 pJ E) 2.2 pJ