The maximum voltage of an ac signal is 8.0 V. What is the rms value of this voltage?
A) 2.8 V
B) 5.7 V
C) 6.2 V
D) 4.0 V
E) 16.0 V
B
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If light travels 63,000 AU in 1 year at 3 × 10^8 m/s, which of these best represents the unit of a light-year?
a. 63,000 AU b. 3 × 10^8 m/s c. 1 year d. All of the other choices are correct.
Uniform Electric Fields: A proton moves 0.10 m along the direction of an electric field of magnitude 3.0 V/m. What is the change in kinetic energy of the proton? (e = 1.60 × 10-19 C)
A. 4.8 × 10-20 J B. 3.2 × 10-20 J C. 1.6 × 10-20 J D. 8.0 × 10-21 J
One ______________ is the distance to a star when the star exhibits a parallax of one second of arc
a. parsec b. light-year c. astronomical unit d. million miles
What is electric current?
a. The same thing as a charge. b. The electrical energy from a generator. c. The electrical energy from by a battery. d. An abrupt and brief electrical discharge, such as a spark. e. A continuous flow of charge.