Transformers: An ideal transformer consists of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?
A. 0.75 A
B. 1.3 A
C. 12 A
D. 48 A
Answer: C
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The sensitive dependence upon initial conditions of the evolution of some physical systems is a feature of
a. gravitation. b. fractals. c. air resistance. d. dynamical chaos. e. quantum mechanics.
An object is placed in front of a thin lens. Which statements are correct in describing the image formed by the lens? (There could be more than one correct choice.)
A) If the lens is convex, the image will never be virtual. B) If the image is real, then it is also inverted. C) If the image is real, then it is also upright. D) If the lens is concave, the image must be virtual. E) If the lens is convex, the image must be real.
The small piston of a hydraulic lift has a diameter of 8.0 cm, and its large piston has a diameter of 40 cm. The lift raises a load of 15,000 N. Assume the pistons each have negligible weight
(a) Determine the force that must be applied to the small piston. (b) Determine the pressure applied to the fluid in the lift.