A normal force
A. is any everyday force
B. is the gravitational force
C. acts perpendicular to the surface
D. is always equal to the weight of an object.
C. acts perpendicular to the surface
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A copper pipe is held vertically and a magnet is dropped down the pipe. The magnet is oriented with the north pole down. What direction do the Eddy currents flow as viewed from above the pipe? If copper bar of approximately the same size and weight is dropped down the tube will it fall faster or slower?
A. CCW above the magnet and CW below the magnet; copper bar will fall slower B. CCW above the magnet and CW below the magnet; copper bar will fall faster C. CW above the magnet and CCW below the magnet; copper bar will fall slower D. CW above the magnet and CCW below the magnet; copper bar will fall faster
Electromagnetic waves can travel in
A) a vacuum. B) water. C) both of these D) none of the above
What role does the main sequence mass of the star play in the formation of heavy elements in the giant stage?
What will be an ideal response?
The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
A. E. B. F. C. G. D. H. E. A.