One kilowatt is a unit of
A) energy.
B) power.
C) voltage.
D) current.
E) resistance.
Answer: B
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A resistor, an uncharged capacitor, a dc voltage source, and an open switch are all connected in series. The switch is closed at time t = 0 s. Which one of the following is a correct statement about this circuit?
A) The charge on the capacitor after one time constant is 1/e of its maximum value. B) The voltage on the capacitor after one time constant is 1/e of the maximum value. C) The voltage on this capacitor after one time constant is 100% of its maximum value. D) The charge on the capacitor after four time constants is about 98% of the maximum value. E) The charge on the capacitor after one time constant is 50% of its maximum value.
The period P of oscillation of a pendulum (the time interval needed to complete one full oscillation) can be expressed in terms of the mass m of the plumb bob, the length l of the string, and the acceleration due to gravity, g, as P = kmb1cgd, where
k, b, c, and d are dimensionless constants. What must be the values of b, c, and d?
Which of the following has the lowest thermal conductivity?
a. Glass b. Iron c. Wood d. Styrofoam
Three equal charges of magnitude + 4.00 ?C are placed at the corners of an equilateral triangle of side 2.00 cm. What is the electric potential energy of the system of these charges?
A) 90.0 J B) 900 mJ C) 0 J D) 216 mJ E) 21.6 J