A doorbell has an input voltage of 120 V. A transformer that steps the voltage down to 12 V has 500 turns on its primary. What is the number of turns on the secondary?
50 turns
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A solar eclipse that occurs when the moon's umbra does not reach Earth's surface is called
a. a total solar eclipse. b. a partial solar eclipse. c. an annular solar eclipse. d. a penumbral solar eclipse. e. an umbral solar eclipse.
Rotational Kinetic Energy: Consider a uniform hoop of radius R and mass M rolling without slipping. Which is larger, its translational kinetic energy or its rotational kinetic energy?
A. Translational kinetic energy is larger. B. Rotational kinetic energy is larger. C. Both are equal. D. You need to know the speed of the hoop to tell.
Atmospheric pressure on Mars is roughly half that of Earth's at sea level
Indicate whether the statement is true or false
The average electric energy density of an electromagnetic wave is 0.600 × 10-7 J/m3. What is the electric field component of this wave?
A) 116 J/Cm B) 116 N/C C) 116 V/m D) All of the answers given are correct. E) None of the answers given is correct.