Impedance: What resistance must be put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40,000 ??
A. 45 k?
B. 40 k?
C. 37 k?
D. 26 k?
Answer: C
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Each pattern shown below would appear on a screen when monochromatic light first passes through a narrow slit of width a and then strikes a screen. The darkest areas on the page represent the brightest areas on the screen. In which case is the slit illuminated with light of the longest wavelength?
A.
B.
C.
D.
E.
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What will be an ideal response?
Reaction forces are given in the figure below for beam ABCDE. The bending moment at C (in kN?m) is:
(A) 0.84 kN?m
(B) 0.96 kN?m
(C) 1.04 kN?m
(D) 1.36 kN?m
A proton initially moves left to right long the x axis at a speed of 2.00 × 10^3 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.300 m before coming to rest. If the proton's mass and charge are 1.67 × 10^-27 kg and 1.60 × 10^-19 C, respectively, what is the magnitude of the electric field?
a. 13.9 N/C c. 28.3 N/C b. 0.0696 N/C d. 0.104 N/C