A transformer transforms voltage while
A) producing energy.
B) producing power.
C) transferring energy from one coil to another.
D) transferring current from one coil to another.
Answer: C
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The focal length of a concave mirror is 20 cm. What is its radius of curvature?
A) 10 cm B) 40 cm C) -40 cm D) 20 cm E) -20 cm
Two concentric imaginary spherical surfaces of radius R and 2R, respectively, surround a positive point charge Q located at the center of the surfaces. When compared to the electric flux ?1 through the surface of radius R, the electric flux ?2 through the surface of radius 2R is
A.
.B.
.C.
D.
E.
The most common kinds of stars are low-luminosity stars
a. True b. False Indicate whether the statement is true or false
At what angle (relative to the horizontal) should a curve 52.0 m in radius be banked if no friction is required to prevent the car from slipping when traveling at 11.6 m/s? (g = 9.80 m/s2)
a. 0.264° b. 1.30° c. 14.8° d. 2.59°