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
A
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An object starts from rest with an acceleration of 2.0 
for 3.0 seconds. It then reduces its acceleration to 1.0 
for 5.0 additional seconds. The total distance covered is
A. 52 m. B. 38 m. C. 11 m. D. 9.0 m. E. 7.6 m.
In Heisenberg's formula, ?p ?x? h, the h symbolizes
A) Planck's constant. B) an average value of Planck's constant. C) the peak value of Planck's constant. D) Planck's constant divided by 2?. E) none of the above
Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz. A person is standing away from the wall, in front of one of the loudspeakers
What is the closest distance from the wall the person can stand and hear destructive interference? The speed of sound in air is 343 m/s. A) 0.34 m B) 1.2 m C) 0.73 m D) 0.37 m E) 1.6 m
The atomic theory was revived and put on a solid experimental foundation in about 1803 by
a. Proust. b. Dalton. c. Boyle. d. Lavoisier.