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2049, summerC, 07 Phy 2049: Physics II 1. Syllabus, grades and exams 2. Electricity, Magnetism, optics 3. Electricity Charge Force Constants

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Phy 2049: Physics II Coulombs Law F in Newtons, r in meter, q in Coulomb and k is the fix. F is a vector, directed along a line joining the charges. The force can be added like a vector

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Phy 2049: Physics II Two equally charged particles are held 2.5X 10 -3 m apart and then released from rest. The initial acceleration of the first particle is observed to be 5.0 m/s2 and that of the second to be 11.0 m/s2. The mass of the first particle is 6.3X10 -7 kg. What is the mass of the second particle? [2.86e-07] kg What is the magnitude of the charge of each particle? [4.68e-11] C

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Phy 2049: Physics II Two equally charged particles are held 2.5X 10 -3 m apart and then released from rest. The initial acceleration of the first particle is observed to be 5.0 m/s2 and that of the second to be 11.0 m/s2. The mass of the first particle is 6.3X10 -7 kg. What is the mass of the second particle? What is the magnitude of the charge of each particle? M 1 a 1 = M 2 a 2 = F = kq 2 /r 2 M 2 = M 1 a 1 /a 2 = 2.86x10 -7 kg q 2 = r 2 M 1 a 1 /k q = 4.68x10 -11 C

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Phy 2049: Physics II In Fig. 21-22, the particles have charges q1 = -q2 = 298 nC and q3 = -q4 = 280 nC, and distance a = 4.0 cm. What are the a) x [0.607] N and b) y [- 0.303] N components of the net electrostatic force on particle 3?

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Phy 2049: Homework Because the summer semester is quite short, the homework assignments are rather large. I would suggest that you do as many as you can at the earliest chance possible. I would certainly urge you not to try them all the night before they are due.

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Phy 2049: Homework Visit Webassign (http://www.webassign.net) Physics is a little like riding bicycle. No one has learned how to ride a bicycle by reading an owners manual. It is very hard in the beginning, but then it becomes instinctive. That is when you start to enjoy the scenery Try doing homework in a group.

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