Divergent boundaries are areas of
A) tensional forces that stretch the crust and generate a spreading center.
B) compressional forces that crunch the crust and generate a spreading center.
C) compressional forces that crunch and shorten the crust by folding and faulting.
D) plate collision.
Answer: A
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Two very long parallel wires in the xy-plane, a distance 2a apart, are parallel to the y-axis and carry equal currents I as shown in the figure
The +z direction points perpendicular to the xy-plane in a right-handed coordinate system. If both currents flow in the +y direction, which one of the graphs shown in the figure below best represents the z component of the net magnetic field, in the xy-plane, as a function of x? (Caution: These graphs are not magnetic field lines.) A) 1 B) 2 C) 3 D) 4 E) 5
A mass m is attached to a vertical spring with a force constant k, it oscillates with a period T. If the spring is cut to one third of its original length and the same mass is attached to it, the new period of oscillation will be
A) less than T. B) greater than T. C) equal to T. D) It could be greater or less than T, depending on how you cut the spring.
A charge +3q is placed at x = 0 and a charge +11q is placed at x = 5 units. Where, along the x-axis is the net force on a charge Q equal to zero?
A) x = 1.72 units B) x = 0.48 units C) x = 0.27 units D) x = 0.21 units E) x = 0.52 units
To subtract a vector from another vector:
a. add the two vectors and make the result negative. b. draw an arrow from the tail of the first vector to the head of the second. c. draw an arrow from the head of the first vector to the tail of the second. d. turn the arrow you are subtracting around, and then add. e. put one on top of the other, put a minus sign by the lower one, and then subtract as if they were numbers.