# Project #27251 - Physics

Read ALL the instructions before bidding I need MORE that just the correct awnsers, every step in the instructions MUST be explained and compleated CLEARLY. Please do not bid if you can not follow all of the steps below.

1. Tell me what concepts are at play in the problem. Why did you or should you know to use the equations that need to be used to solve the problem? If you used equations that did not apply to the problem, why were they not appropriate for the problem?
2. Write out the appropriate equation(s) for the problem SYMBOLICALLY. Explain, in words, what each variable in the equation represents and the units it should have. For example, if E is in your equation, you would say that E represents the electric field and it has units of N/C or V/m.
3. Plug the numbers you know into the equations, with their appropriate units.
4. Solve the equations for the answer, including appropriate units.
5. If you did a problem correctly and only missed the units, show me how the units work out (how you get the final units).

For a few of the problems, I have some questions for you to answer that are specific to the problem that you also need to answer as part of your corrections.

Problem #6: The answer you come up with can be either positive or negative (it doesn't matter which side of the origin you put the charge on). WHY?

Problem #7: Conceptually thinking about this problem, why should you realize (without mathematically solving for the answer) that the proton will speed up?

Problem #8: Why can you NOT find the current after 10 s simply by dividing the charge on the capacitor by the time (10 s)? Why does delta(V) for the capacitor NOT equal delta(V) for the resistor after 10 s?

Problem #9: Explain what the symbols in the equation for E represent. When you are integrating to find the answer, what is your variable of integration? The answer to this question turns out to be negative. From the equation, why is this the case? What is the physical meaning of the answer being negative?

Problem #10 (the test has it numbered #6 -- sorry I didn't catch this): The battery in this problem is not shown. The wires going to the right at the top and bottom represent wires heading to a battery, which has charged the capacitors. To solve this problem you do not need to find the equivalent capacitance. Why not? Tell me how these capacitors are connected. What must capacitors in series have in common? What must capacitors in parallel have in common? Tell me the charge and delta(V) for each capacitor. What is the symbol that represents the energy stored in a capacitor? What is the difference between charge and energy stored? (I ask this last question because many students stopped once they found charge and did not find the energy)

Problem #11 (labeled #7 on the actual test): Draw this picture out again. This problem requires you to use Kirchhoff's Rules. Explain what these rules represent (they both relate to conservation laws -- conservation of what?). Draw the direction of the current through each resistor. How do you know (or should you know) that the current through the middle branch (with the 5 ohm resistor) will be traveling down toward the bottom of the paper? How do you know the value of this current? Using the traditional definition of current (flow of positive charges), label which side of each resistor has the high potential (+) and which has the low potential (-). Write out the loop rule equations piece by piece (show the specific numbers you are plugging in). For example, we know delta(V) for the top 4 ohm resistor is (4 A) * (4 ohms). Yes, this is 16 V, but please write the 4 * 4 in your original equation. Solve your equations for the answers.

 Subject Science Due By (Pacific Time) 04/14/2014 10:00 am
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