PHL206H1 Final: Exam-Short answers.docx

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indigomarten743

19 Apr 2013

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According to aquinas some thing can be self evident in two ways: self evident in itself but not to us, self evident itself and to us. Hence this proposition is self evident in itself but is not self evident to me because i don"t know it completely. Furthermore a cosmologist may know it completely and this proposition is self evident to a cosmologist and in itself. Now the proposition that god exists is self evident in itself but not to us, because we as human beings don"t know the subject. God completely in its essence hence it is not self evident to us but is in itself. We therefore need demonstration for the existence of god by the things that are more known to us, namely by effects.

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We are doing an experiment in my physics lab that involves trying to find the horizontal component of the Earth's magnetic field. Here is a little explanation of what is going on: We have a bar magnet that is placed inbetween a set of Helmholtz coils (125 of them coiled) and we place a certain current (i) on the coils. We then see that the bar magnet begins to try to align itself with the magnetic field, but it will have an angular momentum that will cause it to continue turning past the direction of the magnetic field creating oscillations. Our instructor told us to count 25 oscillations and find the time it takes for 25 to occur. From that we can then find the period of oscillations(T) from each current. Then we can find 1/T^2 from this. We then plot a graph with current(i) on the x-axis and 1/T^2 on the y axis and we find its a straight linear line. Our Instructor stated that the y-intercept will be our b and our slope will be S. From the equation given in our packet which is: (32pN x 10^-7/r x radical 125) x b/S. I know that N is the number of coils, r is the radius(9.6cm), b is the y-intercept, and S is the slope. However, from my graph, my equation for the line of best fit was y=0.967x - 0.3068. plugging this in (32p(125) x 10^-7/9.6cmx radical 125) x (.3068/.967) I get 4.643x10^-4. Putting this into gauss by multiplying times (10^4) i get 4.64 which i know is far off since NASA says its around 0.2-0.5 gauss average around Earth. I would really appreciate the help for what im doing wrong.

For my Physic class, my teacher assigned us with a project of creating a mechnical cannon, meaning no human, electrical, chemical, pneumatic energy can be applied. I was wondering if you guys have any idea of the type of mechnical mechanism that I should use to fire tennis at both a 8 m and 12 m target. Two ideas that I have right now are either to use some spring loaded mechanism or rubber bands. The rules for the testing are that we will only have two minutes to fire as many shots as possible in the hope that it will land in a trash can at the prementioned distance. We get 3 pt if the ball gets in the can, 2pt if it hits the can but does not drop into it, 1 pt if it hits within a 1/2 meter of the can. As a result, a mortar would be prefered since it is over a relatively short distance where a arc would be greatly favorable. At the same time, the mechanism must not only be accurate but fast. In the two minutes, we must fire as many shots as possible for a max of 15 at each location. So five direct hit would be enough. Since time is of the essence, I was thinking that a spring loaded mechanism would be prefered over rubber bands. Please provide any suggestion on other possible mechanism that would produce better results. Also any help on the overall design of the cannon itself will be greatly appreciated. My idea is to have a tube with a spring attached at the bottom. The firer would first pull down the spring and then the loader would drop the tennis ball, upon which the firer would release the spring. I would also appreciate it if you could explain how to add a aiming mechanism on the mortar. I plan to have it on a base plate with a bipod.

In a lab that I am doing for one of my Physics classes, it asksa couple questions that I don't totally understand...

-The lab is about Newtons Second law whereF=Mass*Acceleration

-We have a motion sensor setup to detect the motion of an objectmoving because of gravity(acceleration).

-They give us the theoretical model x(t) = At² + Bt + Cin order to extract acceleration values from the position data.They tell us "The prediction is that acceleration is a constant, soan appropriate model is of the form..." previously typed where A,B, and C are constant parameters.

Here are the questions it asks...

1) Why is this the appropriate form?

2) What physical quantities do these parameters have?

3) What is A and how is it related to acceleration?

I know that B = inital velocity and that C = initial position,but what is A, or I guess what is the mathematical relationshipbetween A and acceleration?

I will rate GOOD and QUICK if you can help me understand thesesimple questions!

Thanks in advance!

PHL206H1 Final: Exam-Short answers.docx

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