The primary winding of an electric train transformer has 400 turns and the secondary has 50 . If the input voltage is 120 V (rms) what is the output voltage?
a. 15 V (rms)
b. 30 V (rms)
c. 60 V (rms)
d. 2.4 V (rms)
e. 960 V (rms)
a
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An 800-N woman stands at rest on two bathroom scales so that one scale shows a reading of 500 N. The reading on the other scale is
A) 200 N. B) 300 N. C) 400 N. D) 800 N. E) none of the above
A ball of mass 5 kg attached to a string is swung in a horizontal circle of radius 0.5 m. If the tension in the string is 10 N, the work done by the tension in one revolution is ________ J.
Fill in the blank(s) with the appropriate word(s).
Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2. What is the magnitude of the electric field at a point 4.0 cm from the center of the two surfaces?
A. 3.8 N/C B. 4.1 N/C C. 3.5 N/C D. 3.2 N/C E. 0.28 N/C
Sphere A carries a net charge and sphere B is neutral. They are placed near each other on an insulated table. Which statement best describes the electrostatic force between them?
A) There is no force between them since one is neutral. B) There is a force of repulsion between them. C) There is a force of attraction between them. D) The force is attractive if A is charged positively and repulsive if A is charged negatively. E) The force is repulsive if A is charged positively and attractive if A is charged negatively.