A 20-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.0 m/s in a region where the magnetic field of the earth is 60 ?T directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
a. 36 ?V
b. 18 ?V
c. 31 ?V
d. 24 ?V
e. 21 ?V
b
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Which of the following is one important reason why most large astronomical telescopes are reflecting telescopes rather than refracting telescopes?
A) Reflecting telescopes have their heaviest component (the mirror) at the bottom rather than the top of the telescope's tube. B) Reflecting telescopes take up less space than refracting telescopes. C) Reflecting telescopes are taller than refracting telescopes. D) For a mirror and lens of the same diameter, a mirror will collect more light.
The figure shows two packages that start sliding down a 20° ramp from rest a distance along the ramp from the bottom
Package A has a mass of 5.0 kg and a coefficient of kinetic friction 0.20 between it and the ramp. Package B has a mass of 10 kg and a coefficient of kinetic friction 0.15 between it and the ramp. How long does it take package A to reach the bottom? A) 2.7 s B) 3.0 s C) 3.2 s D) 3.5 s
A +4.0-?C charge is placed on the x axis at x = +3.0 m, and a ?2.0-?C charge is located on the y axis at y = ?1.0 m. Point A is on the y axis at y = +4.0 m. Determine the electric potential at point A (relative to zero at the origin).
A. 6.0 kV B. 8.4 kV C. 9.6 kV D. 4.8 kV E. 3.6 kV
A 30-?F capacitor is charged to 40 V and then connected across an initially uncharged 20-?F capacitor. What is the final potential difference across the 30-?F capacitor?
a. 15 V b. 24 V c. 18 V d. 21 V e. 40 V