agine that you ve been invited to try out a new hoversuit , and here show it works: Someone has set up a large flat sheet, many kilometers across, somewhere on the Earth, and they ve charged the sheet up to a uniform charge density of 1.42 x 10^-6 C/m2. You are issued a special suit that you wear, and it has controls on it which allow you to charge the suit up to any number of Coulombs (C), positive or negative, that you might want. The idea is that you can control the amount of electrical repulsion (or attraction) between the suit and the charged sheet below you. What is the strength of the electric field in the region above the charged sheet? (This is easy, since I m going to give you the formula, which is E = 2 pi k Q/A, where k is the electrical constant and Q/A is the charge density.) Same situation, but this time the charge density in the sheet is 1.42 x 10^-6 C. Suppose your mass (including the suit) is 74.7 kg. How much charge must you give the suit if you want to be able to just hover stationary above the charged sheet? 1.55E-02 C 9.14E-03 C 4.57E-03 C 1.37E-02 C

agine that you ve been invited to try out a new hoversuit , and here show it works: Someone has set up a large flat sheet, many kilometers across, somewhere on the Earth, and they ve charged the sheet up to a uniform charge density of 1.42 x 10^-6 C/m2. You are issued a special suit that you wear, and it has controls on it which allow you to charge the suit up to any number of Coulombs (C), positive or negative, that you might want. The idea is that you can control the amount of electrical repulsion (or attraction) between the suit and the charged sheet below you. What is the strength of the electric field in the region above the charged sheet? (This is easy, since I m going to give you the formula, which is E = 2 pi k Q/A, where k is the electrical constant and Q/A is the charge density.) Same situation, but this time the charge density in the sheet is 1.42 x 10^-6 C. Suppose your mass (including the suit) is 74.7 kg. How much charge must you give the suit if you want to be able to just hover stationary above the charged sheet? 1.55E-02 C 9.14E-03 C 4.57E-03 C 1.37E-02 C

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A dust particle of charge, q, and mass, m, is initially at rest in a uniform electric field with strength of magnitude, E. If the dust particle is then allowed to move freely, how long will it take for the particle to travel a distance, d, in a straight line? (Ignore gravity) a. (md/2qE)1/2 b. (2qEd/m)1/2 c. (qE/2md)1/2 d. (md/qE)1/2 e. (2md/qE)1/2
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9. Imagine that you ve been invited to try out a new hoversuit , and here s how it works: Someone has set up a large flat sheet, many kilometers across, somewhere on the Earth, and they ve charged the sheet up to a uniform charge density of 8.52 x 10^-6 C, and your mass including the suit is 87.0 kg. You are issued a special suit that you wear, and it has controls on it which allow you to charge the suit up to any number of Coulombs (C), positive or negative, that you might want. The idea is that you can control the amount of electrical repulsion (or attraction) between the suit and the charged sheet below you. How much charge must you give the suit if you want to fall down toward the sheet, but at the same rate as if you were on the Moon (remembering that the gravitational acceleration on the Moon is 1/6 what it is on Earth)? 2.07E-03 C 2.37E-03 C 2.66E-03 C 1.48E-03 C
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QUESTION 10 Suppose you were hovering stationary as in question 6 above, except now with sheet charge density 3.56 x 10^-6 C and your mass including the suit 84.7 kg. Suppose that while you were hovering, someone threw you a rock of mass 5.3 kg, and that you caught it. What would now be your rate of acceleration toward the ground? 0.58 m/s^2 9.81 m/s^2 9.23 m/s^2 0.70 m/s^2
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