The magnetic field near a strong permanent bar magnet might be 500
A) microGauss.
B) Tesla.
C) Gauss.
D) milliGauss.
E) MT.
C
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"Weightlessness" occurs when an object
a. has zero acceleration. b. is in free fall. c. is midway between Earth and the Moon. d. loses weight.
A polyethylene bar (E 5 1.4 GPa, ? 5 0.4) of diameter 80 mm is inserted in a steel tube of inside diameter 80.2 mm and then compressed by axial force P. The gap between steel tube and polyethylene bar will close when compressive load P is approximately:
(A) 18 kN
(B) 25 kN
(C) 44 kN
(D) 60 kN
How much power is theoretically available from a mass flow of 1 000 kg/s of water that falls a vertical distance of 120 m?
a. 1.18E+6 kW b. 1.20E+5 kW c. 1.18E+3 W d. 8.17E+1 W e. 1.18E+6 W
Which of the following sources of energy presents the fewest pollution problems under normal operating conditions?
a. Coal b. Natural gas c. Nuclear fission d. Hydroelectric power