Recent content by the_man

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    Statistics, testing hypothesis

    Homework Statement http://prntscr.com/8ea2rk Homework Equations In statistics, when testing hypothesis for both sides (left and right), is it possible that Xaverage - MUo = 0 (upper part of the equation I provided)? If so how to solve this kind of task? The Attempt at a Solution If I get...
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    A math problem related to betting

    I just want to say this is nothing illegal because I've used the word "Betting". The thing is that I have a math problem and I need someone to help me find the best solution. I don't know if this is the right place to post it. If not, please don't delete it, just moved it. Thanks. Homework...
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    Sine Graph Help: Calculating Uoutput & Drawing Graph

    I think I am right. Take a look at google link for where solution is +120°. Why is google moving that graaph 120°? It should be moved 120° left of y-axis, right?
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    Sine Graph Help: Calculating Uoutput & Drawing Graph

    Homework Statement TASK So I have this task with opamp and I have Uinput Sine Graph, now I have to calculate Uoutput and write it as sine function and draw the sine graph. I know that this is an inverting OPAMP which means that output signal will be inverted, so I just have to flip this...
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    Can someone explaing OPAMPS tasks to me?

    I am learning about operational amplifiers or so called OPAMPS. And I know how to solve these two examples EXAMPLE 1 - inverting opamp EXAMPLE 2 - non-inverting opamp But how to solve these two: Homework Statement IMAGE 1 1. As you can see on picture No1, it is solved, but I need...
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    Maple The best software for math and physics?

    Which program is the best for math and physics? What do you think about Maple 17?
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    Inertia Question: Resolve the Wheel Motion

    M=F*r F=m*α α=ω/T Ek=(Iω^2)/2
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    Inertia Question: Resolve the Wheel Motion

    Okay. I got it! Now its Ek=7,5kJ
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    Inertia Question: Resolve the Wheel Motion

    I can get energy in Jules but then its very small number, but i don't get it why is a small number?
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    Inertia Question: Resolve the Wheel Motion

    Homework Statement The full metal wheel of radius 30 cm, 300 kg of mass moment of inertia I = 1/2 (mr ^ 2) operating torque 50nm in time 1 min. Determine the angular acceleration, angular speed of wheel, revolutions per second, revolutions that the wheel makes to achieve this speed, kinetic...
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    What is the Efficiency of a Gas Machine in an A->B->C Change?

    okay man, thanks!
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    What is the Efficiency of a Gas Machine in an A->B->C Change?

    So from A->B formula is PV=nRT then I get dT=((p2-p1)*v1)/nR? from B->C formula is W=p2(v2*v1) and with ideal gas dT=(p2(v2-v1))/nR? But how to get Q from that?
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    What is the Efficiency of a Gas Machine in an A->B->C Change?

    Homework Statement The task is to get Q, that gas has received through A-B-C change? Second task is to get usefulness of the machine? http://img40.imageshack.us/img40/8372/toplinaabc.jpg Homework Equations W=pV The Attempt at a Solution If I use W=pV i get 0 from A->B so i...
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    How Does Pressure Change with Volume in an Isothermal Process?

    Homework Statement Gas temperature 30C, volume 20cm3 and pressure 2*10^5. We have isothermal change and volume goes to 27cm3, what's the change of pressure?Homework Equations pV=nRT The Attempt at a Solution (20*10^-6*2*10^5)/30 and then we get constant. p1*V1=const -> p1=const/V1