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    I Dependence of friction on area.

    Hello Guys, I have been pondering on the nature of the frictional force and its dependency on the area of contact for the past few days and I had already searched for plausible explanations for the same.Although I could gather a few discrete points ,I couldn't get a complete picture of it. Some...
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    Pump has a suction lift of more than 10.3 m

    As I was going through a course on Hydraulics, there was a brief explanation about how the atmospheric pressure can only support a water column of 10.3 m.A few more points that are prerequisite to the discussion are as follows 1)A fluid cannot be pulled;it has to be pushed. 2)A centrifugal...
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    Fibres vs Solid

    Consider a steel rod of diameter 'd'. If the same rod is broken up into strands and arranged parallel to one another so as to form a new rod of the same diameter 'd' ,Which will have a higher load bearing capacity?. Instead of being arranged parallel , If they are made into a rope of similar...
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    Stress and strain

    Im currently studying a course on the mechanics of solids..the reference book i use is by Popov..But i cant completely understand the concept of stress in an axial loading.Like for instance. If a weight W acts on a rod(ignore the rod's weight),stress will vary point to point along the...
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    Correct definition of time dilation

    Can someone give me the correct definition of time dilation(or explain it in such a way that it can be used to tackle any problem)?? What i believe now is "a moving clock ticks more slowly than a clock at rest"..but according to me this is inadequate because there can be two situations...
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    Phase velocity

    why is the phase velocity(c^2/v) greater than c?? since v<c it should be greater than c.. how does this happen?
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    Time dilation-doubts

    Can anyone explain about time dilation in a simple way? I am confused about these facts: 1) If an observer A at rest relative to a moving spacecraft sees an event e1 in the space craft and measures the time interval to be t1 on his clock and t2 on the clock in the spacecraft...
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    Exact differential equations

    How can i solve differential equations that are reducible to exact form? please explain each method. thanks
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    Tough differential equation

    i tried to solve this question in all the ways i knew but it wouldnt work ..please help xy^2dy/dx + y = x^2 i tried to solve it by using linear first order differential equation technique and also by using different exact and reducable exact differential equaions... help me
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    Time dilation and length contraction

    can both time dilation and length contraction occur for the same observer??? i dont think it is possible since then c=reduced length/increased time which is impossible(since c is constant)... Am i wrong?
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    What is the difference between relative velocity and resultant velocity?

    relative velocity and resultant velocity???also in a connected(with strings) pulley system,how can we calculate the acceleration and velocities of the pullies and the masses connected onto it???
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    I just dont get the idea on how to do this [projectile motion]

    i dont know how this works.....when a body is projected at an angle "theta" with the horizontal above a height 'h'...what is its maximum height and maximum range???should i just treat it as two separate motions or is there another way to do it....i can solve if it is just a parabolic projection...
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    Can any of you guys help to understand coefficient

    of restitution???? i have no idea what it is and how it works...also please tell me about the line of impact and the line of tangent..... in a semielastic collision ,how can we know the velocity of after collision ...
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    Can any of you guys help to understand kinetic energy?

    can any of you guys help to understand kinetic energy??? when we apply kinetic energy conservation...should we split the velocity into two components??? eg))))) two blocks of mass m are connected by a spring and are both given a velocity v at an angle of 45 degree with the horizontal(they...