The speed of light is
A) 300 km/s.
B) 3 million km/s.
C) 3 km/s.
D) 3,000 km/s.
E) None of the above.
E
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A charge of 25 nC is uniformly distributed along a circular arc (radius = 2.0 m) that is subtended by a 90-degree angle. What is the magnitude of the electric field at the center of the circle along which the arc lies?
A. 81 N/C B. 61 N/C C. 71 N/C D. 51 N/C E. 25 N/C
Nuclear reactors that produce consumer power in present times are powered by
A) fission. B) fusion. C) both fission and fusion.
A long, straight wire (radius = 2.0 mm) carries a current of 2.0 A distributed uniformly over a cross section perpendicular to the axis of the wire. What is the magnitude of the magnetic field at a distance of 1.0 mm from the axis of the wire?
a. 0.40 mT b. 0.80 mT c. 0.10 mT d. 0.20 mT e. 0.75 mT
A satellite circles planet Roton every 2.8 h in an orbit having a radius of 1.2 × 107 m. If the radius of Roton is 5.0 × 106 m, what is the magnitude of the free-fall acceleration on the surface of Roton?
A. 31 m/s2 B. 27 m/s2 C. 34 m/s2 D. 40 m/s2 E. 19 m/s2