Surrounding every magnet is
A) a magnetic field.
B) an electric field.
C) both of these
D) neither of these
Answer: A
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The strong force is an attractive force between
A. Two protons. B. Two neutrons. C. A proton and a neutron. D. Both A and B. E. All of A-C.
Radio station KBOB broadcasts at a frequency of 85.7 MHz on your dial using radio waves that travel at 3.00 × 108 m/s
Since most of the station's audience is due south of the transmitter, the managers of KBOB don't want to waste any energy broadcasting to the east and west. They decide to build two towers, transmitting in phase at exactly the same frequency, aligned on an east-west axis. For engineering reasons, the two towers must be AT LEAST 10.0 m apart. What is the shortest distance between the towers that will eliminate all broadcast power to the east and west?
The rate at which work is done is equivalent to which of the following?
a. increase in potential energy b. thermal energy c. potential energy d. power
How much money does it cost to leave on 10 60 watt lights for 15 hours, if the cost of electricity is 8 cents per kWh?
a. 15¢ b. 32¢ c. 72¢ d. 120¢ e. 480¢