Snell's Law: As shown in the figure, a laser positioned on a ship is used to communicate with a small research submarine resting on the bottom of a lake. The laser is positioned 12 m above the surface of the water, and it strikes the water 20 m from the side of the ship. The water is 58 m deep and has an index of refraction of 1.33. How far horizontally is the submarine from the side of the ship? (Assume all numbers are accurate to three significant figures.)
A. 69 m
B. 49 m
C. 89 m
D. 59 m
E. 79 m
Answer: A
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Write Darcy’s law for permeability processes.
What will be an ideal response?
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A coil lies flat on a table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?
A) The induced current flows counterclockwise. B) There is no induced current in this coil. C) The induced current flows clockwise. D) The current flows clockwise initially, and then it flows counterclockwise before stopping.
Three boxes are pushed across a frictionless horizontal surface as shown. When we compare the normal force 
that mass 2m exerts on mass 5m with the normal force 
that mass 5m exerts on mass 10m, we find that
?
?
A.
= = F.B.
= F> .C.
= .D.
> .E.
> .?