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  1. S

    Physics: Post your doubts here!

    First thing to look at is the Work-Energy Theorem in this form: ΔW = ΔK.E So, the change in kinetic energy of any object is equal to the work done on that object. (Note: any object that can be modeled as a particle; for example, if two blocks connected by a spring were hurled through the air...
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    Physics: Post your doubts here!

    For the first image (the potential energy question): Let's first try to find out whether the potential energy of the system increases or decreases: The field shown can either correspond to a large, positively charged sheet on the left side of the image, or a large, negatively charged sheet on...
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    Physics: Post your doubts here!

    For Question 13, there are a few important points to be noticed in the question: i) the string is light, so we can assume that the magnitude of the tension for in the string is the same at all points along the string; Suppose the string were indeed heavy, each part of the string would have...
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    AS Physics P1 MCQs Preparation Thread.

    Okay, so the concept here is that for a string or rubber band or any other elastic material that exerts a tension force, the assumption can be made that the tension is the same at any and all points on the string/rubber band. Another thing is that the force of tension on the object due to the...
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    AS Physics P1 MCQs Preparation Thread.

    This problem is an equilibrium problem; in the Physics sense of the word, there are two condition we can apply here: i) The sum of all net forces on the object is equal to zero. AND ii) The sum of all net torques on the object is equal to zero. The first rule is more helpful here; consider...
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    AS Physics P1 MCQs Preparation Thread.

    In this question, the first thing to note is that the water levels equalize; the net result of this is that the water level on either side will be equal to h/2 . The second thing to note is that there is actually only a relatively small change in the situation; this change can be viewed in two...
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    AS Physics P1 MCQs Preparation Thread.

    It's basically just balancing moments; Since the entire set up can be assumed to be stationary once the 50g mass is added, the tension in the rope is Tension = (20/1000) * 9.81 = 0.1962 N This means that the moment caused by the suspended mass is Moment = Tension * Distance from pivot =...
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    AS Physics P1 MCQs Preparation Thread.

    Q. 10 : If a net force acts on an object, it will cause a change in momentum of the object (usually the change in is in velocity, either in terms of direction or magnitude). The average force between any two times is the total change in momentum that occurs between those two times divided by...
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    AS Physics P1 MCQs Preparation Thread.

    If you write down the equations of motion for the two objects (barrel coming down and man going up), you get: Barrel: Tension = 120g - 120 * acceleration Tension = 1200 - 120a Man: Tension = 80g + 80a Tension = 800 + 80a Equating the two, 1200 - 120a = 800 + 80a 400 = 200a a = 2...
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    Solved physics Paper 5??

    Thanks, I was worrying whether it would be enough or not - thanks a lot!
  11. S

    Solved physics Paper 5??

    Hey, i'm really sorry I couldn't post it earlier, I was kinda pressed for time on other matters. Sorry if the diagram isn't good enough (It looks bad, but in this time, it's the best I could do - sorry!) Good Luck for all your exams!
  12. S

    Solved physics Paper 5??

    If you are referring to dividing t by 10 to give T, the uncertainty is also divided by 10. The reason is that when you multiply/divide two quantities together, you add their percentage uncertainties to find the percentage uncertainty in the resulting value. In this case, if you want to find...
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    Solved physics Paper 5??

    I'll try to upload an image later, but hopefully, for now, the explanation is okay - sorry! The independent variable in the investigation is the field strength B at the center of the coil and the dependent variable is, then, the radius of the coil. Since the strength of the magnetic field at...
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    Solved physics Paper 5??

    One question; have you included the powers of 10 in your uncertainty calculation? Because if the uncertainty in your gradient is 0.2, your worst fit gradient would have to be 0.20035, which is over 500 times your best fit gradient! Could you please check if you have missed out any powers of ten...
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    Solved physics Paper 5??

    For question 2 (d) (ii), the basic idea is that when two quantities are multiplied or divided together, the percentage uncertainties in their values are added together and used to find the absolute uncertainty in the product. So, over here, the calculation required for μ is: μ = Tension/(4 *...
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    Physics paper 5 notes?

    Hopefully the following website will help: http://symbols.radicasoftware.com/Symbol/Single/PC/Photo-Cell.html However, I doubt that the exact circuit symbol for the photocell would be required in the diagram, since it doesn't say anywhere that the symbol is required, as far as I've seen, and...
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    Physics paper 5 notes?

    If i've understood your question correctly (sorry if I haven't - please correct me in that case!), then the matter should be easy to resolve: The gradient of the Worst Acceptable Line can be a little more than or a little less than the gradient of the Best Fit Line (If you join the top of the...
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    Physics P5 in 5 minutes !!!

    The question statement (Page 5) mentions that: "The time t for 10 oscillations is recorded for a pendulum of length l. The period T of the pendulum is determined. The procedure is then repeated for different lengths." Therefore, if the time for 10 oscillations is t, the time period of the...
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    Physics P5 in 5 minutes !!!

    This is for the October - November 2010 p52 question, 2(a): If you mean the first part where you have to find out the gradient of the line of lgT on the y - axis and lgL on the x - axis, the gradient is b because taking log on both sides, we get lgT = lgA + b * lgL If lgT = y and lgL = x...
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    Physics Paper 5 tips

    Imagine you're drawing a graph of terminal velocity versus mass of an object. Suppose you have a value of the terminal velocity of an object as 50 +- 10 ms^-1. This basically means that the mass is recorded as 50 ms^-1, but due to any kinds of errors creeping into the reading, the mass might...
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