Zero potential in household electricity is called ______________
Fill in the blank(s) with correct word
ground
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A standing wave is oscillating at 690 Hz on a string, as shown in the figure. What is the speed of traveling waves on this string?
A) 280 m/s B) 410 m/s C) 210 m/s D) 140 m/s
A metal rod of length L in a region of space where a constant magnetic field points into the page rotates about an axis through its center at constant angular velocity ?. The ends, A and E, make contact with a split ring that connects to an external circuit. The current in the external circuit of resistance R has magnitude
A.
B.
.C.
.D.
.E.
.The current in a coil with a self-inductance of 1.5 mH increases from 0 to 2.0 A in a tenth of a second. What is the induced emf in the coil?
a. 15 mV c. 0.10 V b. 0.30 V d. 30 mV
At high noon, the Sun delivers 990 W to each square meter of a blacktop road. What is the equilibrium temperature of the hot asphalt, assuming its emissivity e = 1? (? = 5.67 × 10^?8 W/m2/K4)
a. 364°C b. 637°C c. 90.5°C d. 181°C e. 136°C