The magnetic field due to the current in a long, straight wire is 8.0 ?T at a distance of 4.0 cm from the center of the wire. What is the current in the wire? (?0 = 4? × 10-7 T ? m/
A)
A) 0.20 A
B) 0.40 A
C) 0.80 A
D) 3.2 A
E) 1.6 A
E
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A pinned-end copper strut (E 5 110 GPa) with length L 5 1.6 m is constructed of circular tubing with outside diameter d 5 38 mm. The strut must resist an axial load P 5 14 kN with a factor of safety of 2.0 with respect to the critical load. The required thickness t of the tube is approximately:
(A) 2.75 mm
(B) 3.15 mm
(C) 3.89 mm
(D) 4.33 mm
Geosynchronous satellites orbit the Earth at a distance of 42 000 km from the Earth's center. Their angular speed at this height is the same as the rotation rate of the Earth, so they appear stationary at certain locations in the sky. What is the force acting on a 1 500-kg satellite at this height?
a. 85.0 N b. 333 N c. 404 N d. 457 N
In Einstein's General Theory of Relativity, spacetime is
A) one dimensional B) two dimensional C) four dimensional D) three dimensional
A wave is a vibration in
A) space. B) time. C) both of these D) none of the above