hree point charges are located on a circular arc as shown in the figure below. (Let r = 3.96 cm. Assume that the +x-axis is to the right and the +y-axis is up along the page.) +3.00 nC -2.00 nC 30.0° 30.0°\ +3.00 nC (a) What is the total electric field at P, the center of the arc? magnitude Your response differs from the correct answer by more than 100%. N/C to the right v direction (b) Find the electric force that would be exerted on a -5.47 nC point charge placed at P. magnitude The response you submitted has the wrong sign. N direction to the left

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Q: Initial Angular Momentum (J-s)

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A: radius of disc (r) = 7 cm= 0.07 m angular speed (ω) = 5 rev/s=5×2π rad/s= 31.4 rad/s

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.