Compare two vibrating strings, each has the same tension, but the second has four times the mass density of the first. The wave speed along the 2nd string is how many times the speed along the 1st?
A) 1/4
B) 1/2
C) 4
D) 2
E)
B
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A capacitor is connected to the terminals of a variable frequency oscillator. The peak voltage of the source in kept fixed while the frequency is increased. Which statement is true?
A. The rms current through the capacitor decreases. B. The rms current through the capacitor increases. C. The phase angle between the current and source voltage changes. D. The current becomes zero when the frequency is large enough.
At what distance from the central axis of a long straight thin wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of
the Earth's magnetic field of about 5.0 × 10-5 T? (?0 = 4? × 10-7 T • m/A) A) 1.0 cm B) 2.0 cm C) 3.0 cm D) 4.0 cm E) 5.0 cm
The ideal shape for the primary mirror of a telescope is
a. concave circular. b. convex circular. c. concave parabolic. d. convex parabolic. e. plane.
Sugars, starches, and cellulose are all classified as compounds called ______________
Fill in the blank(s) with correct word