If a single force acts on a moving object
A. the momentum of the object will change only if the force is in the same direction as the velocity of the object.
B. the momentum of the object can only change direction, not magnitude.
C. the momentum of the object must change.
D. the momentum of the object can only change magnitude, not direction.
Answer: C
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A series ac circuit consists of an inductor having a reactance of 80 ? and an inductance of 190 mH, a 40-? resistor, a capacitor whose reactance is 100 ?, and an ac source. The rms current in the circuit is measured to be 2.2 A
What is the rms voltage of the source? A) 98 V B) 93 V C) 88 V D) 91 V E) 96 V
Light from a 560-nm monochromatic source is incident upon the surface of fused quartz (n = 1.56) at an angle of 30°. What is the angle of reflection from the surface?
a. 30° c. 60° b. 75° d. 15°
A complex tone can be produced by combining two or more __________
Fill in the blank(s) with correct word
The wavelength of a periodic wave is 0.800 m. If the frequency is 400 Hz, then what is the magnitude of the k vector of the wave?
A. 8.56 
B. 7.85
C. 7.02
D. 6.35
E. 5.98