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    Dv/dr or v/r

    in some cases we use dv/dr to find speed and in some cases we use v/r which 1 will be more appropriate to use?
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    Potential and electric field

    in which case potential is distance times the electric field..plz explain so that i am cleared the the basics of this.
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    Simple forms of limits

    LIMx\rightarrowinfinite (bn+an)1/n it is given that 0<a<b in this case why do we take bn or an common to make the inside element 0...and how do u guys take to solve this kind of situation how do u think?
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    Potential energy and separation graph the graph is as per the link but my question is that at a particular point the potential energy becomes thre any significance for it?
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    Fluid mechanics barometer problem

    to construct a barometer,a tube of length 1m is filled completely with mercury and is inverted in a mercury cup.the barometer reading on a particular day is 76cm.suppose a 1m tube is filled with mercury upto 76cm and then closed by a cork.It is inverted in a mercury cup and the cork is...
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    Circle co-ordinate

    the question: if a straight line c(-*81/2,-*81/2) making an angle 135 dge with x-axis,cuts the circle x=5cosm y=5sinm in points A and B ,find length of segment AB . in the equation of line by solving i got y=-x and tried to solve and ended up getting length of AB as 0 but the solution has...
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    How does cell phones work?

    i mean when data is sent from the network tower to the cell phone,can the data be detected by any other device?can the wave be concentrated in a particular direction(particular device) specifically.....
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    Derviation of Moment of inertia

    our lecturer defined MI as inertia of body in circular motion(i don't know anything about inertia) except that it is something to oppose my question is that when M.I in circular motion depends on both mass and radius(distance from axis) of the body. why MI is represented as mr^2 why is it...
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    Centripetal and fugal forces

    when we travel around a circular path we exert force on the path(ground)can be considered centrifugal force and petal which acts inwards,as a reaction to violates the rule that force of centrifugal is pseudo force.......... then what exactly is centrifugal force who gave this...