A parallel plate capacitor is constructed with plate area of 0.40 m2 and a plate separation of 0.10 mm. How much charge is stored on it when it is charged to a potential difference of 12 V?
What will be an ideal response?
0.42 μC
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An air-filled capacitor stores a potential energy of due to its charge. It is accidentally filled with water in such a way as not to discharge its plates. How much energy does it continue to store after it is filled?
(The dielectric constant for water is 78 and for air it is 1.0006.) A) 0.077 mJ B) 468 mJ C) 0.040 mJ D) 6.00 mJ
A metal sphere of radius 80. mm is charged to a potential of -0.50 kV. With what velocity must an electron be fired toward the sphere if it is to just barely reach the sphere when started from a position 15. cm from the center of the sphere?
What will be an ideal response?
A 5.0-m long, 12-kg uniform ladder rests against a smooth vertical wall with the bottom of the ladder 3.0 m from the wall. The coefficient of static friction between the floor and the ladder is 0.28
What distance, measured along the ladder from the bottom, can a 60-kg person climb before the ladder starts to slip? A) 4.0 m B) 3.7 m C) 1.7 m D) 1.3 m E) 3.3 m
A surprise from the Pioneer Venus photos was that:
A) the craters on Venus are all large. B) the clouds rotate around the planet in only four days, very unlike the slow surface rotation. C) the clouds of Venus are mainly water vapor, like our own. D) the highest volcano, Maxwell Mons, protrudes above the cloud deck. E) no impact craters at all are found on the Venusian surface.