Ahighly charged piece of metal (with uniform potential throughout) tends to spark at places where the radius of curvature is small, or at places where there are sharp points. the breakdown electric field strength for air is about 3 106 v/m. (a) it is possible to calculate the maximum possible potential (relative to infinity) in air of a metal sphere of 18 cm radius. first, what is the maximum charge you can put on this sphere? c for that amount of charge, what is the potential of the sphere relative to infinity? volts (b) next, calculate the maximum possible potential relative to infinity in air of a metal sphere of only 0.4 mm radius. what is the maximum charge you can put on this sphere? c for that amount of charge, what is the potential of the sphere relative to infinity? volts these results are related to the fact that if a piece of metal has a small radius of curvature, it will spark at relatively low potential relative to infinity.
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Physics, 22.06.2019 19:00, hairyears3394
Review multiple-concept example 7 in this chapter as an aid in solving this problem. in a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. in one instance, the radius of the circle is 0.626 m. at one point on this circle, the ball has an angular acceleration of 66.1 rad/s2 and an angular speed of 12.6 rad/s. (a) find the magnitude of the total acceleration (centripetal plus tangential) of the ball. (b) determine the angle of the total acceleration relative to the radial direction.
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