Charge of uniform density 12 nC/m is distributed along the x axis from x = 2.0 m to x = 5.0 m. What is the electric potential (relative to zero at infinity) at the origin (x = 0)?
a. 91 V
b. 99 V
c. 82 V
d. 74 V
e. 140 V
B
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A conducting rod slides at 3.0 m/s on metal rails separated by 2.0 m. The 0.66 m T magnetic field is into the paper. If the resistance is 220 m
what is the current in the circuit?
A. 18 mA
B. 9.0 mA
C. 87
A
D. 3.0
A
E. 4.5 mA
A ball is tossed upward. Neglecting air drag, the acceleration along its path is
A) 0 g. B) g downward. C) g upward. D) g upward, then g downward. E) none of the above
Process of Science: Pluto is no longer considered a planet. Explain the new discoveries that led to this change
What will be an ideal response?
When Copernicus first created his Sun-centered model of the universe, it did not lead to substantially better predictions of planetary positions than the Ptolemaic model. Why not?
A) Copernicus used perfect circles for the orbits of the planets, though they are actually ellipses. B) Copernicus placed the planets in the wrong order going outward from the Sun. C) Copernicus misjudged the distances between the planets. D) Copernicus placed the Sun at the center, but did not realize that the Moon orbits Earth.