The diameter of a 12-gauge copper wire is 0.081 in. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A
At this current, what is the drift velocity of the electrons? The number of electron carriers in 1.0 cm3 of copper is 8.5 × 1022 and e = 1.60 × 10-19 C. A) 0.044 mm/s
B) 0.44 mm/s
C) 0.44 cm/s
D) 0.44 m/s
E) 4.4 cm/s
B
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In the context of Einstein's general theory of relativity, briefly explain Schwarzschild black holes
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Anders and Taisen release their snowballs from the same height and at the same time. Ander's is dropped while Taisen’s is thrown horizontally. Which one hits the ground first?
A. the "dropped" snowball B. the "thrown" snowball C. they hit at the same time D. it depends on how hard Taisen threw E. it depends on the initial height
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. A light ray that reflects from mirror 1 at angle ?M1 then strikes the second mirror and reflects at ?M2 such that the angle between the ray reaching mirror 1 and the ray leaving mirror 2 is 180°. The angle between the two mirrors is
a. 0°. b. 45°. c. 90°. d. 150°. e. 235°.
A capacitor of capacitance C takes 2 s to reach 63% of its maximum charge when connected in series to a resistance R and a battery of emf
How long does it take (from zero initial charge) for this capacitor to reach 95% of its maximum charge? A) 3 s B) 5 s C) 7 s D) 4 s E) 6 s