The windings of a DC motor have a resistance of 6.00 ?. The motor operates on 120 V AC, and when running at full speed it generates a back emf of 105 V. What is the starting current of the motor?
A)
2.50 A
B)
5.00 A
C)
17.5 A
D)
20.0 A
E)
37.5 A
D
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Faraday's Law: A bar magnet is pushed through a coil of wire of cross-sectional area 0.020 m2 as shown in the figure. The coil has seven turns, and the rate of change of the strength of the magnetic field in it due to the motion of the bar magnet is 0.040 T/s. What is the magnitude of the induced emf in that coil of wire?
A. 5.6 × 10-3 V B. 5.6 × 10-2 V C. 5.6 × 10-1 V D. 5.6 × 10-4 V E. 5.6 × 10-5 V
The Planck era is another name for the present period of time in the universe
Indicate whether the statement is true or false
If you were to take a voyage through the entire disk of the Milky Way, what kind of material would you spend most of your time in?
A) empty space-a pure vacuum B) rarefied clouds of atomic hydrogen C) star clusters D) hot bubbles of ionized hydrogen E) cool, dense clouds of molecular hydrogen
The amount of dark matter in the universe is
A) about the same as the amount of visible matter. B) many times more than the amount of visible matter. C) about twice as much as the amount of visible matter. D) many times less than the amount of visible matter. E) entirely unknown at the present time.