Power: The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ? ? m. The toaster is designed to operate at a voltage of 120 V. How much power does it draw in normal operation?
A. 370 W
B. 360 W
C. 380 W
D. 400 W
E. 410 W
Answer: A
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A 1.30-m string is held fixed at both ends. When driven by a 140-Hz source, the string vibrates in 4 distinct segments. What is the natural fundamental frequency of the string?
a. 35.0 Hz b. 70.0 Hz c. 215 Hz d. 431 Hz e. 45.5 Hz
Which of the following best describes a substance in which the temperature remains constant while at the same time it is experiencing an inward heat flow?
a. gas b. liquid c. solid d. substance undergoing a change of state
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A spring with spring constant k = 800 N/m is compressed 12 cm from its equilibrium position. A spring with spring constant k = 400 N/m has the same elastic potential energy as the first spring when its extension is
a. 0.060 m. b. 0.085 m. c. 0.12 m. d. 0.17 m. e. 0.24 m.