Wave speed and wave frequency are two terms that are
A) basically the same.
B) fundamentally different from each other.
C) opposites.
D) reciprocals.
Answer: B
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A 120 N traffic light is located at the midpoint of a cable between two poles. The cable makes and angle of 30
to the horizontal at each pole. What is the tension in the cable?
A. 60.0 N B. 90.0 N C. 140 N D. 110 N E. 120 N
A muon formed high in the Earth's atmosphere travels at a speed 0.870c for a distance of 4.00 km before it decays. What is the muon's lifetime as measured in its reference frame?
a. 3.1E–5 s b. 7.6E–6 s c. 1.5E–5 s d. 5.1E–5 s e. 4.3E–5 s
As a space shuttle is launched into orbit, the direction of its acceleration
a. always points upward. b. always points downward. c. varies between pointing upward and pointing downward. d. stays constant.
A point charge of +3.0 mC is located at the origin of a coordinate system and a second point charge of -9.0 mC is at x = 1.00 m. What is the electric potential at the x = 0.50 m point? (ke = 8.99 × 10^9 N×m2/C2)
a. -5.4 × 10^4 V c. 16 × 10^4 V b. 11 × 10^4 V d. -11 × 10^4 V