A copper ring can be made to levitate about the extended bar of an electromagnet because the magnetic field induced in the ring
A) remains strong and steady.
B) opposes the field producing it.
C) is attracted to the top end of the bar.
D) none of the above
Answer: B
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An astronaut drops a rock on the moon. It falls 1 meter in 1 second. In 4 seconds, it falls a total distance of
A) 8 meters. B) 4 meters. C) 9 meters. D) 12 meters. E) 16 meters.
The type of mirror that will allow you to see large areas normally hidden from your view is
a. concave. b. convex. c. plane. d. half-silvered. e. Polaroid.
What is the direction of 
in the wave as it passes P?
A. A B. B C. C D. D E. Toward the viewer. F. Away from the viewer. T. The vector is zero. G. AA H. BB I. CC J. DD
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
(a) Determine the force that must be applied to the small piston. (b) Determine the pressure applied to the fluid in the lift. What will be an ideal response?