A circular loop of one turn and radius 5.0 cm is positioned with its axis parallel to a magnetic field of 0.60 T. By means of high explosives, the area of the loop is suddenly reduced to essentially zero in 0.50 ms. What emf is induced in the loop?
What will be an ideal response?
9.4 V
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What observational evidence supports the idea that Mercury once shrank by some 20 kilometers in radius?
A) the presence of many long, tall cliffs B) the presence of many impact craters C) the characteristics of the Caloris Basin D) Mercury's unusually high density
A board of mass m lies on the ground. What is the magnitude of the force you would have to exert to lift one end of the board barely off the ground (assuming that the other end still touches the ground)?
A. 
B. 
C. 
D. The answer depends on the board’s length.
E. Other (explain)
The quantity called the "enclosed mass" M( A) concentrated in the center
B) spread out over a large volume
C) distributed in the shape of a doughnut, with a hole in the center
D) impossible to say
Streams transport great quantities of sediment. The most effective transport of sediment occurs in
A) laminar flow. B) turbulent flow. C) particle flow. D) groundwater flow.