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    Question on Electricity

    A Coil with an inductance of 20 H and a resistance of 10 Ohms is connected in series with a battery of emf 12 V and a switch. Calculate the a. rate of change current and the final current. b. current after 3.0 seconds.
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    Question On fluid mechanics

    A cylindrical tank of diameter 90 cm rests on top of a platform 6m high. Initially the tank is filled with water to a depth of 3m. A plug whose are is 3 cm^2 is removed from the orifice on the side of the tank at the bottom. 1) at what speed will water strike the ground? 11) how long...
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    Question on Rotational Dynamics

    1.A uniform Disc of Radius R is rotating in its own plane with angular velocity w when it is placed flat on a rough table. If u the coefficient of sliding friction is independent of velocity show that the time taken for the disc to come to rest is (3RW)/(4ug). How does the kinetic energy of...
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    Intergrate e^x^2

    well, need Intergrate e^x^2 any help:college level Thanks
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    Physics Help : gravitational field

    Two stars, masses 10^20kg and 2* 10^20kg respectively, rotate about their common centre of mass with an angular speed of w. Assuming that the only force on a star is the mutual gravitational force between then, calculate w. Distance = 10^6km and that G= 6.7*10^-11Nm^2/kg^2
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    Trig And calculus

    Need help in integration and trig How do you integrate 1. 1/(1-x^5) 2. 1/(1+x^4) and the trig question. Show that (a^2 - b^2)/c^2 = sin(A-B)/sin(A+B)