A capacitor of capacitance C = 6 ?F is connected in series with a resistor R = 5 M? to a battery of emf E = 15 V. What is the value of the current in the circuit when the capacitor has reached 20% of its maximum charge?
A)
6.5 ?A
B)
2.4 ?A
C)
1.3 ?A
D)
4.7 ?A
E)
9.1 ?A
B
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Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistances of these two wires compare?
A) Both wires have the same resistance. B) The longer wire has 1/3 the resistance of the shorter wire. C) The longer wire has 3 times the resistance of the shorter wire. D) The longer wire has 9 times times the resistance of the shorter wire. E) The longer wire has 27 times times the resistance of the shorter wire.
When 5.0 A at 110 V flows in the primary of an ideal transformer, how many amps at 24 V can flow in the secondary?
A) 5.0 A B) 1.1 A C) 23 A D) 4.6 A
The figure shows a uniform, horizontal beam (length = 10 m, mass = 25 kg) that is pivoted at the wall, with its far end supported by a cable that makes an angle of 51° with the horizontal. If a person (mass = 60 kg) stands 3.0 m from the pivot, what is the tension in the cable?
a.
0.83 kN
b.
0.30 kN
c.
0.38 kN
d.
0.42 kN
e.
3.0 kN
If a force is directed perpendicular to the displacement, no work is done by that force
Indicate whether the statement is true or false