According to special relativity, what is the speed of light measured in a space ship traveling at 0.40 c?
A. 0.60 c
B. 1.4 c
C. 0.86 c
D. 1.0 c
E. None of these choices are correct.
D. 1.0 c
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A wire (mass = 50 g, length = 40 cm) is suspended horizontally by two vertical wires which conduct a current I = 8.0 A, as shown in the figure. The magnetic field in the region is into the paper and has a magnitude of 60 mT. What is the tension in either wire?
A. 0.15 N B. 0.68 N C. 0.30 N D. 0.34 N E. 0.10 N
A driver in a 1000 kg car traveling at 20 m/s slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the horizontal road is 0.80, how long will the skid marks be?
A) 26 m B) 21 m C) 33 m D) 24 m
If the intensity of an electromagnetic wave is 80 MW/m2, what is the amplitude of the magnetic field of this wave? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
A) 0.82 mT B) 0.33 µT C) 10 T D) 14 T E) 0.58 mT
A transformer for a laptop computer converts a 120-V input to a 24-V output. Compared with the number of turns on the primary coil, the secondary has
A) 1/5 as many turns. B) 5 times as many turns. C) the same number of turns. D) none of the above