The electric current in a copper wire is normally composed of
A) electrons.
B) protons.
C) ions.
D) all of the above
Answer: A
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If you divide the total distance traveled on a car trip (as determined by the odometer) by the time for the trip, are you calculating the average speed or the magnitude of the average velocity? Under what circumstances are these two quantities the same?
A. We are calculating the average speed. The average speed and the acceleration will be the same if the movement is not in a straight line from beginning to end. B. We are calculating the average speed. The average speed and the average velocity will be the same if the movement is in a perfect straight line from beginning to end. C. We are calculating the instantaneous speed. The average speed and the instantaneous momentum will not be the same if the movement is in a perfect circle from beginning to end.
Charge of a uniform density (8.0 nC/m2) is distributed over the entire xy plane. A charge of uniform density (3.0 nC/m2) is distributed over the parallel plane defined by z = 2.0 m. Determine the magnitude of the electric field for any point with z = 3.0 m.
A. 0.79 kN/C B. 0.17 kN/C C. 0.62 kN/C D. 0.34 kN/C E. 0.28 kN/C
A tire pressure gauge reads 30 psi when the atmospheric pressure is 14 psi. The net force on 2 square inches of the tire is __________
Fill in the blank(s) with correct word
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?