Suppose that you wish to construct a simple ac generator having an output of 12 V maximum when rotated at 60 Hz. A uniform magnetic field of 0.050 T is available. If the area of the rotating coil is 100 cm2, how many turns do you need?
A) 16 B) 8 C) 32 D) 128 E) 64
E
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A suitcase is sitting on a horizontal conveyor belt, which is moving at speed v. The work done by the frictional force on the suitcase is a. positive
b. negative. c. zero. d. impossible to determine without knowing the mass of the suitcase.
___________ is (are) observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form two or more images of the same quasar
a. A double-lobed radio galaxy b. Superluminal expansion c. The gravitational lens effect d. A blazar e. Gravitational waves
Leptons are the fundamental particles that are the building blocks of hadrons
a. True b. False Indicate whether the statement is true or false
The ocean can be divided into several vertical layers—the surface zone, a transition zone, and the deep zone. As one descends to lower depths, water pressure ________ and temperature ________
A) increases; decreases B) decreases; increases C) increases; increases D) decreases; decreases