Simple Harmonic Motion: A package is oscillating on a spring scale with a period of 4.60 s. At time t = 0.00 s the package has zero speed and is at x = 8.30 cm. At what time after t = 0.00 s will the package first be at x = 4.15 cm?
A. 0.575 s
B. 0.767 s
C. 1.15 s
D. 1.30 s
E. 1.53 s
Answer: B
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A 30-?F capacitor is charged to an unknown potential V0 and then connected across an initially uncharged 10-?F capacitor. If the final potential difference across the 10-?F capacitor is 20 V, determine V0
a. 13 V b. 27 V c. 20 V d. 29 V e. 60 V
The electric potential at the surface of a charged conductor
a. is always zero. b. is always independent of the magnitude of the charge on the surface. c. may be set equal to zero by adding an appropriate constant to the potential at all points of space. d. is always such that the potential is zero at all points inside the conductor. e. is always such that the potential is always zero within a hollow space inside the conductor.
What is a planetary nebula?
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What is the equivalent resistance between points A and B in the figure when R = 18 ??
a.
48 ?
b.
64 ?
c.
80 ?
d.
96 ?
e.
110 ?