Two boundaries associated with seafloor spreading centers are
A) convergent boundaries and transform fault boundaries.
B) divergent boundaries and transform fault boundaries.
C) oceanic-oceanic boundaries and divergent boundaries.
D) divergent boundaries and convergent boundaries.
Answer: B
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A 1 m long rod for an aircraft must carry an axial load of 5×106 N, and the rod design mass is 54 kg. The rod is to be made from a high strength aluminum alloy that has a density of 2.7×103 kg/m3 , and the yield stress must be equal to twice the applied stress in the metal
(a) What is the minimum yield stress for the aluminum alloy? (b) The elastic modulus for aluminum alloys is 70×109 Pa, what is the elongation of the rod?
A long wire lies in a tangle on the surface of a table, as shown below. When a current is run through the wire as shown, the largest component of the magnetic field at X points
a.
into the table.
b.
out of the table.
c.
parallel to the nearest segment of wire.
d.
antiparallel to the nearest segment of wire.
e.
along a circle which has its center at the center of the overall loop.
The electrical force on a 2-C charge is 60 N. The electric field where the charge is located is
A) 20 N/C. B) 30 N/C. C) 60 N/C. D) 120 N/C. E) 240 N/C.
A torque of 20.0 N•m is applied to a bolt. The bolt rotates through an angle of 180 degrees. The work done in turning the bolt is
A. 72.5 J. B. 51.9 J. C. 62.8 J. D. 49.9 J. E. 58.4 J.