A steady current of 0.15 A exists in a wire for 20 s
a. How much net charge passes by a point in the wire?
b. How many electrons does this charge represent?
a. 3.0 C
b. 1.9
×
1019 electrons
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A 1000-kg truck moving at 10 m/s that brakes to a stop in 5 s has an average braking force of
A) 1000 N. B) 2000 N. C) 3000 N. D) 4000 N. E) 5000 N.
A football kicker is attempting a field goal from out. The ball is kicked and just clears the lower bar with a time of flight of If the angle of the kick was 45°, what was the initial speed of the ball, assuming no air resistance?
A) 21.5 m/s B) 19.7 m/s C) 2.2 m/s D) 39 m/s
A series circuit has a 100-? resistor, a 0.100-?F capacitor, and a 2.00-mH inductor connected across a 120-V rms ac source operating at resonant frequency. What is the rms value of the voltage across the capacitor?
A) 54.0 V B) 120 V C) 150 V D) 533 V E) 170 V
Two nuclei which share the same mass number A always are (Hint: Eliminate any wrong answers.)
a. stable. b. unstable. c. isotopes. d. isobars. e. radioactive.