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Recent content by Xylferion
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Physics: Post your doubts here!
You already know that the potential at A is 0.20. That means V in = 0.2 You're trying to find out what V out is, assuming there is a "linear" change in the voltmeter reading. With a linear change, the feedback resistance at 15 degrees Celsius is 2500 ohms. V out / V in = 2500 / 740 V out =... -
Physics: Post your doubts here!
Gain = V out / V in -----------> V out = V in x Gain -------> V out = 95x10^-3 * 71 = 6.75 V If you chose +/- 5V as your power supply, 6.75 is over that limit. This results in saturation, which when you plot a graph of Voltage/Time, will clip the values beyond 5V. You don't want this, so you... -
Physics: Post your doubts here!
That's a comparator circuit, which basically means that you get an output after comparing the two inputs. If V+ > V-, you get +5V as your output. If V- > V+, you get -5V as your output. They tell you that non-inverting input is at a fixed 1.0V. That means, for values >1.0V, the output is -5V... -
Physics: Post your doubts here!
You're asked to find the feedback resistances. V out / V in = Feedback resistance / Input Resistance They said for each switch position, V out = 1.0 V, so just plug that in for each part. For R(A), 1.0 / 100x10^-3 = Feedback resistance of A / 1000 Feedback resistance = 10,000 ohms For... -
AICT (9713) Paper 4 23rd March 2016 Doubts
I believe we had to use the dates provided in the paper. Why? For the simple reason that some of our friends over in New Zealand and India had to do the paper earlier. They would have been using a different date in that case, which makes their answers completely different from ours. So to keep... -
Physics: Post your doubts here!
There's no fixed value for how much it reduces, but I'd say approx. half the previous amplitudes. Just make sure the heavy damping curve is always flatter and that all the points on the curve are below the points on the light damping curve. -
Physics: Post your doubts here!
Look at the graph. You don't have to write anything on the y-axis, they already have put E(k) as the max value there. Also what do you mean how did I get 4? Look at the previous graph.. 4 is the amplitude of displacement, the sine wave starts at 4 cm. -
Physics: Post your doubts here!
Attaching the light feathers = reducing weight of metal cube. This results in heavy damping. Damping occurs because of resistive forces in the air, if you have something that is very light, the effect of these forces will be higher and the amplitude of oscillation decreases at all frequencies... -
Physics: Post your doubts here!
The amplitude's already been given to you, that is, E(k). What you need to pay attention to is the way kinetic energy behaves in relation to the displacement of the ball. When the ball is at its amplitude, as shown in the diagram. The kinetic energy is zero because the velocity is zero at that... -
Physics: Post your doubts here!
The answer is actually A and here's why. As the object is accelerating, that mean's its speed is changing, and by changing I mean that it is increasing. When the acceleration peaks at the top and begins to turn, the velocity is not zero. So you can eliminate option C. When the curve begins to... -
Physics: Post your doubts here!
Alpha is stopped by paper and Beta by about 5 mm of aluminum, neither of them are stopped by air. -
Physics: Post your doubts here!
Ducility is a measure of the ability of a solid to deform under the action of stress. If you think about it, Youngs modulus is the ratio of stress / strain. A high youngs modulus means it will be harder to deform the solid. A low youngs modulus means that it would be easier to deform the solid... -
Physics: Post your doubts here!
http://physics-ref.blogspot.ae/2015/05/physics-9702-doubts-help-page-154.html ---> He explains it well here. -
Physics: Post your doubts here!
Write down the values they've given you first. Mass of water = 300 kg each minute = every 60 seconds final velocity = 20 ms^-1 They want the force, since we have mass, the formula we're going to use is F = ma. We have the value of the mass, all we need is the acceleration. a = v - u / t Since...