Building codes usually limit the current carried by a No. 14 copper wire to 15 A. Many household circuits are wired with this size wire. What is the drift velocity of the electrons in this case? The diameter of this wire is 1.6 mm
Assume one conduction electron per atom in copper. The atomic weight of copper is 63.3 g/mol and its density is 8900 kg/m3. Avogadro's number is 6.022 × 1023 molecules/mol and e = 1.60 × 10-19 C.
A) 5.51 × 10-4 m/s
B) 1.65 × 10-3 m/s
C) 4.56 × 10-4 m/s
D) 4.89 × 10-5 m/s
E) 4.44 × 10-2 m/s
A
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Car A travels with speed v around curve number one, which has a radius r. Car B travels with speed 2v around curve number two, which has a radius 2r. The acceleration will be
A. zero for both cars. B. greater for car B. C. greater for car A. D. the same for both cars.
The process of convection occurs in
A) solids. B) liquids. C) gases. D) fluids. E) none of the above
Most of the Seyfert galaxies are ________.
A. spiral B. irregular C. elliptical D. All of these choices are correct.
A projectile is launched from ground level at an angle of 30.0° above horizontal with a speed of 10.0 m/s. If the projectile is moving over level ground, what is the maximum height above the ground that the projectile reaches?
A) 2.54 m B) 1.27 m C) 5.00 m D) 3.54 m E) 20.0 m