A transformer is a device that
A) operates on either DC or AC.
B) operates only on AC.
C) operates only on DC.
D) increases the power level of a circuit.
B
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Transparency of the atmosphere is lowest for radiation of
A) ultraviolet light. B) visible light. C) infrared light.
In the Drude model of electrical conduction, the current density is directly proportional to
a. the average time interval between successive collisions. b. the number of charge carriers per unit volume. c. the square of the electron charge. d. the electric field present in the wire. e. the product of all four quantities listed above.
The circuit below contains three 100-W light bulbs and a capacitor. The emf is 110 V and the capacitor is fully charged. Which light bulb(s) is(are) brightest?
a.
A
b.
B
c.
C
d.
A and B
e.
A and C
Constant Acceleration Kinematics: A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?
A. 15 s B. 30 s C. 45 s D. 4.2 s