Transverse waves y1 = A1 sin(k1x??1t) and y2 = A2 sin(k2x??2t), with A2>A1, start at opposite ends of a long rope when t = 0. The magnitude of the maximum displacement, y, of the rope at any point is
A.
B.
C.
D.
.E.
.Answer: C
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A generator produces 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 ?. Find the percentage power lost in the transmission line
A) 0.012% B) 0.024% C) 0.036% D) 0.048% E) 0.050%
A 10-? resistor is in series with a 100-?F capacitor at 120 Hz. What is the phase angle?
A) -37° B) -82° C) +37° D) -53° E) -4.7°
Process of Science: Name a testable hypothesis from nebular theory that was proven true in observations of extrasolar planets. Does this mean the theory is complete?
What will be an ideal response?
A policeman investigating an accident measures the skid marks left by a car on the horizontal road
He determines that the distance between the point that the driver slammed on the brakes (thereby locking the wheels) and the point where the car came to a stop was 28.0 m. From a reference manual he determines that the coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. How fast was the car going when the driver applied the brakes? A) 12.8 m/s B) 45.7 m/s C) 21.4 m/s D) 10.7 m/s E) 32.9 m/s