Phys 110 - Physics Test 3

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PHYS 110 - Physics Test 3
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PHYS 110

Grossmont College
FALL, 2015
Campus: Grossmont
Department of Physics
Test 3
(Time allowed: DUE 11:35 AM, MONDAY 12/14/2015)
NOTE:

1. Attempt all questions.
2. You may get help (not answers) from tutors and/or classmates.
3. Make sure you show your work, or give an explanation of how you came to your answer. If there is no work or explanation there will be NO POINTS.

1. A force with magnitude F is needed to separate two charges by a distance r. What will be
1
the new force F ′ , needed to keep the two charges separated by a distance 2 r?
2. A a particle with charge of Q = 3.2 × 10−6 C is stuck to the top of a table. If another particle with charge of q = 7.7 × 10−7C, and mass m = 0.10kg is floating on top of the particle with charge Q; how high above the table is the particle with charge q?
3. You want to make a particle accelerator in your house. You are going to use a power source to charge two parallel plates as shown in Figure 1. The particles will then be accelerated from one plate to the other. The particles you want to accelerate have a mass of m1 =
3.5 × 10−12 kg, and a charge of q = 8.5 × 10−6C. You would like to accelerate the particles to a speed of v = 6.0 × 106 m . s (a) What should be the potential difference across the two parallel plates?
(b) Now you want to accelerate different particles (with out changing the potential difference across the plates). The new particles have a mass of m2 = 1.4 × 10−13 kg, and the same charge as the first particles. If the distance between the plates is d = 0.15m, what is the force needed to accelerate one of the new particles?
(c) What will be the speed of the new particles when they reach the other side?

CONTINUED

–2–

PHYS 110

4.…...

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