HW-_Circular_motion__Friction

# 035 m 2 the distance between the center of the earth

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close can you place the block before it starts to slide? 0.35 m 2) The distance between the center of the Earth and the center of the Moon (mass 7.3x10 22 kg) is 3.85x10 8 m. 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) 5.6x10 13 C answers may vary depending on rounding. How many electrons is this? 3.5x10 32 e’s

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THIS SIDE IS CLASSWORK 1) A block with a mass of 1.5 kg, and 2.5x10 14 excess electrons, is placed as close as possible to a fixed charge of 6x10 -6 C. If the closest the block can be to the fixed charge is 0.6 m before it starts to slide, what is the coefficient of static friction between the block and the surface? 0.41 2) In a Hydrogen atom, the electron orbits the single proton in the center of the atom. They both have the same charge (1.6x10 -19 C). The electron, mass 9.11x10 -31 kg, orbits the proton at a distance of 5.3x10 -11 m. What is the orbital speed of the electron? 2.18x10 6 m/s THIS SIDE IS CLASSWORK 1) A block with a mass of 1.5 kg, and 2.5x10 14 excess electrons, is placed as close as possible to a fixed charge of 6x10 -6 C. If the closest the block can be to the fixed charge is 0.6 m before it starts to slide, what is the coefficient of static friction between the block and the surface? 0.41 2) In a Hydrogen atom, the electron orbits the single proton in the center of the atom. They both have the same charge (1.6x10 -19 C). The electron, mass 9.11x10 -31 kg, orbits the proton at a distance of 5.3x10 -11 m. What is the orbital speed of the electron? 2.18x10 6 m/s
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• Fall '09
• Lyons

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