Harry Potter points his wand at the sun and cries “Spotificus!” Within 8 minutes, observers all over the earth see a large string of sunspots form on the sun. Did Harry create the sunspots?
A. Yes. Harry is a very powerful wizard.
B. Yes, if magical effects travel at the speed of light.
C. No. This is not physically possible, even with magic.
B. Yes, if magical effects travel at the speed of light.
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A 2.0 kg softball is pitched to you at 20. m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, the average force the bat exerted was
A) 0.40 kN. B) 40. N. C) zero. D) 0.80 kN. E) 0.65 kN.
A point charge Q = 7.00 × 10-9 C is placed at the origin of an xy-coordinate system. What is the electric field intensity E at a distance of x = 30 cm from this charge? (Use k = 9 × 109 Nm2/C2.)
A) 100 N/C B) 400 N/C C) 500 N/C D) 600 N/C E) 700 N/C
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Three originally uncharged infinite parallel planes are arranged as shown. Then the upper plate has surface charge density ? placed on it while the lower plate receives surface charge density ??. The net charge induced on the center plate is
A. 0. B. ??/2. C. +?/2. D. ??. E. +?.