In a transformer, how many turns are necessary in a 110-V primary if the 24-V secondary has 100 turns?

A) 458
B) 240
C) 110
D) 22
E) 4


A

Physics & Space Science

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Coulomb's Law: Two equally charged tiny spheres of mass 1.0 g are placed 2.0 cm apart. When released, they begin to accelerate away from each other at 414 m/s2. What is the magnitude of the charge on each sphere, assuming only that the electric force is present? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)

A. 140 nC B. 120 nC C. 95 nC D. 75 nC

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The most common form of gas in the disk of the Milky Way Galaxy is

A) molecular hydrogen. B) gas in hot bubbles. C) atomic hydrogen gas. D) gas in stellar winds.

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You measure the temperature of two objects and one of them is warmer than the other. From this you can conclude

1.that the warmer object contains more heat than the cooler object. 2.that the warmer object contains more internal energy than the cooler object. 3.that the warmer object was heated for a longer period of time than was the cooler object. 4.none of these statements.

Physics & Space Science

What is the direction of the neutral atom’s electric field at the location of the charged particle?

A. A B. B C. C D. D E. Zero F. Other G. AA H. BB I. CC J. DD

Physics & Space Science