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

Physics & Space Science

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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

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