The current supplied by a battery as a function of time is I(t) = (0.88
A)e-t/(6.0 hr). What is the total number of electrons transported from the positive electrode to the negative electrode from the time the battery is first used until it is essentially dead? (e = 1.60 × 10-19 C)
A) 1.2 × 1023
B) 4.4 × 1022
C) 5.3 × 1023
D) 3.3 × 1019
A
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Three objects are connected by massless wires over a massless frictionless pulley as shown in the figure. The tension in the wire connecting the 10.0-kg and 15.0-kg objects is measured to be 133 N. What is the mass M?
A) 8.33 kg B) 33.9 kg C) 35.0 kg D) 52.8 kg E) 95.0 kg
If a magnet produces a force on a current-carrying wire, the wire
A) produces a force on the magnet. B) may or may not produce a force on the magnet. C) none of these
A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstream 300 m. How fast can she swim in still water?
A) 1.24 m/s B) 1.83 m/s C) 0.50 m/s D) 1.42 m/s E) 0.25 m/s
What charge accumulates on the plates of a 2.0-?F air-filled capacitor when it is charged until the potential difference across its plates is 100 V?
A) 50 ?C B) 100 ?C C) 150 ?C D) 200 ?C