If one-half of the members of a symphony orchestra are absent because of head colds, thus reducing the overall intensity of sound by 50%, what will be the reduction in the decibel level?
a. 5 dB
c. 48 dB
b. 3 dB
d. 1.7 dB
B
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A 120-V rms voltage at 60 Hz is applied across an inductor and a 200-? resistor. If the impedance of this circuit is 216 ?, what is the rms value of the current?
A) 0.336 A B) 0.446 A C) 0.556 A D) 0.667 A E) 0.767 A
If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = ?80 nC, and q = 36 nC in the figure, what is the magnitude of the electric force on q?
a.
5.0 N
b.
4.4 N
c.
3.8 N
d.
5.7 N
e.
0.60 N
Using a longer-handled wrench to loosen a tight nut allows you to
A. apply more torque to the nut. B. exert more force on the nut. C. increase the moment of inertia of the nut. D. pull harder on the wrench.
A ray of light enters an equilateral prism made of material with n = 1.45. What angle of incidence, 
will cause the internally refracted ray to be parallel to the base of the prism?
A. 46.5
B. 30.0
C. 20.2
D. 5.70
E. this cannot happen