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Physics 1 Applications of Coulomb's Law 1. A block with mass 2kg and charge of 1.5x10-C is located near a fixed (stuck where it is) charge of the same amount. The block is resting on the floor. The coefficient of static friction is 0.827. How close can you place the block before it starts to slide? 4353m 2. The distance between the center of the Earth and the center of the Moon (mass 7.3x102kg) is 3.85x10'm. ge is It takes 28 days for the Moon to orbit the Earth. Using this information, find how much charge should be e so t placed on the Earth and the Moon so the Moon remains in orbit. ASSUME THE EARTH AND MOON WILL HAVE THE SAME CHARGE AND GRAVITY DOES NOT EXIST. 5.59x10" C answers may vary depending on rounding. How many electrons is this? 3.49xlove's ild t iced 3. Two charged tennis balls are placed in a frictionless tube. The tennis balls are both positively charged. One tennis ball hovers over the other a distance of 0.2m apart. If -0.2m the charge on the tennis ball on the bottom is +4uC, how many electrons were removed from the hovering 0.3kg tennis ball above? (HINT: Draw an FBD for the hovering tennis ball) 2.04x1Que's 4. charge, q, sits at the bottom of an incline with an angle of 0. A distance, r, In from that change sits a mass, m, with a charge, 4q. If the coefficient of static friction between the mass and the incline is u, what is the distance r between the two charges so the mass does not slide UP the incline? USE g instead of 9.8m/s2 . (Good algebraic test K problem) r = 2q mg(ucose +sine)