RC Circuits: A charged capacitor is connected in series with a resistor and an open switch. At time t = 0 s, the switch is closed. Which of the graphs below best describes the current I through the resistor as a function of time t?
A. A
B. B
C. C
D. D
E. E
Answer: B
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Suppose a 0.30-kg mass on a spring that has been compressed 0.20 m has elastic potential energy of 1.0 J. How much further must the spring be compressed to triple the elastic potential energy?
a. 0.35 m c. 0.10 m b. 0.15 m d. 0.05 m
The half-life of 19N is 0.42 s. What is the decay constant for this isotope?
a. 1.7 × 10^–11 Ci b. 1.7 s–1 c. 1.1 s–1 d. The decay constant is not defined for a half-life of less than one second.
Identify (name) the 12 leptons:
What will be an ideal response?
Pressure in a Liquid: As shown in the figure, fluid fills a container having several sections. At which of the indicated points is the pressure greatest?
A. A B. B C. C D. D E. The pressure is the same at each of the labeled points.