before it starts to slide, what is the coefficient of static friction between the block and the surface? 0.41*3) The distance between the center of the Earth and the center of the Moon (mass 7.3x1022kg) is 3.85x108m. It takes 28 days for the Moon to orbit the Earth. Using this information, find how much charge should be placed on the Earth and the Moon so the Moon remains in orbit. ASSUME THE EARTH AND MOON WILL HAVE THE SAME CHARGE. (HINT: May want to find velocity of the moon- check out old M.R.’s for circular motion and velocity) 5.6x1013Canswers may vary depending on rounding. How many electrons is this? 3.5x1032 e’s4) Three charges are fixed on the ends of insulating rods as show in the diagram. Charge A has a charge of +6µC (where µ means “micro” and mathematically is x10-6) charge Bhas a charge of -4µC, and charge C has a charge of +8µC. a) Find the net force acting on C. 9.74N @ 38.16º5) A +5µC charge is placed 2m from a +7µC charge. Where should you place a +3µC charge so the net force acting on the 3µC charge is zero? 0.916m6) A +4µC charge is placed 3m from a -8µC charge. Where should you place a -2µC charge so the net force acting on the -2µC charge is zero? 7.24m
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