# Recently Active Physics Questions

• If a cylindrical rod is dropped from a height 'h', Then at what angle should it strike the ground such that its angular momentum is maximum. The friction between the ground and the rod is 'Î¼', The length of t ...
replied2008-10-13 22:56:05
• Why do we study derivatives up to acceleration only ...
replied2008-10-13 00:29:57
• A body is on a wedge(Traingular ABC), which is right angled at B and B touches the ground. Body is at point A A body can move from A to C by two different pathes: - Sliding along the inclined plane AC (lenght l) without frict ...
replied2008-10-12 07:02:33
• A thin spherical shell having uniform density is cut in two parts by a plane and kept separated. The point A is the center of the plane section of the first partand B of the second part. Show that the gravitational field at A ...
replied2008-10-12 04:01:43
• If a satellite is revolving in a radius of 3R around earth energy req 2 make it escape? I made 2 solns but can.t find out which is correct... 1. TEi=-GMm/6R so if GMnm/6R is provided it will escape ...
replied2008-10-12 03:03:21
• A train goes around a circle, the first time with an average velocity of 100 km/h. How fast should the train be when going around the circle again a second time, so that the average velocity over the two loops is 200 km/h? ...
replied2008-10-11 11:39:28
• View this image: http://techtantra.in/targetIIT_images/bernoulli.jpg Explain the phenemenon! ...
replied2008-10-11 07:19:10
• I am in a car moving with constant velocity, such that i cannot see what is going on outside. I dont know whether the car is at rest or in motion. How will I find it out? (Without using any external help! ) like a speedomente ...
replied2008-10-11 06:57:10
• A heavy block of mass(high density!) is thrown into water from a boat in a small tank made for experiment. Will the water level a)increase b)decrease c) remain the same. ...
replied2008-10-11 06:38:41
• if a charged partical goes unaccelerated in a region containing electric and magnetic field then what are the conditions for it ...
replied2008-10-11 05:55:21
• There is a heap of sand... coefficient of friction is r... what is the maximum slope of the heap? some thing like this... or may be height.. i think same difference... u know one u know both ...
replied2008-10-11 05:53:10
• in the RC circuits in order to calculate time constant the resistance we are to take is the resistance of the branch in which capacitor is there or the net resistance of the circuit or something else? Also please reply the pr ...
replied2008-10-10 12:30:40
• 1 kg of melting ice and 1 kg of boiling water are mixed: ice and water Wht is the Temperature of the mixture? ...
replied2008-10-09 22:05:48
• Why current in a ckt flows very fast though electron travel with drift velocity of few centimeters per second? Like if it is a very long wire, will switching on the circuit immediately take the current to the other end? why? ...
replied2008-10-06 23:10:13
• two circular rings A and B , each of radius a=130 cm are placed co-axially with their axes horizontal in a uniform electric field E=10^5 N/C directed vertically upwards distance between the centers of these rings A and B is h ...
replied2008-10-03 08:21:03
• two resistors of temperature coefficient of resistance a1 and a2 have resistance R01 and R02 at 0 degreeC find the net value of temperature coefficient a when the two resistances are in parallel ...
replied2008-10-03 08:19:53
• For a Shell with inner radius r, outer radius R with a charge Q(+ve) at the centre, what is the expression for its "Self-Energy" and Potential Energy??? ...
replied2008-10-03 08:02:24
• Two Uniformly Charged Rings are placed co-axially, at a seperation d, one with +Q and the other with -Q, then find the value of electric field at a point on the axis, as a function of x, where x is the ditsnce frm the ring ch ...
replied2008-10-03 07:59:45
• what is the work done in taking a charge from one point to another between the plates of a capacitor? The electric field due to a charged sheet at a particular point(Ïƒ/2Îµ0) does not depend upon the distance between the plat ...
replied2008-10-03 07:57:04
• When any coloured light passes through another coloured translucent or transparent medium it takes the colour of the medium. why?? pls explain in details! ...
replied2008-10-01 02:51:45
• Electric Potential of earth is zero because earth is a good- 1)semiconductor 2)conductor 3)insulator 4)dielectric pls explain also ...
replied2008-10-01 00:20:10
• If a wire of Resistance 20Î© is covered with ice (at 0Â°C) and a voltage of 210V is applied across the wire find the rate of melting of ice ...
replied2008-09-29 21:35:14
• A bomb is droped from a plane flying horizontally with uniform speed. Show that the bomb will explode vetically below the plane. will this be true if the plane flies with uniform speed but not horizentally? ...
replied2008-09-28 21:56:45
• Please make the following terms very clearly. I am not understanding them from books... * Yield point * yield strength * permanent set * plastic deformation * tensile strength * fracture point * proportional limit Pls give so ...
replied2008-09-28 13:36:10
• What is fringe width ...
replied2008-09-27 23:55:24
• a battery with external resistance R with galvanometer in series are connected to form a circuit Across the galvanometer another external resistance 40ohm is connected in parallel through an open key K if key K is pressed the ...
replied2008-09-27 20:19:13
• why red colour is used in danger signals? ...
replied2008-09-26 21:42:25
• A block of mass m slides on a horizontal table under the action of a horizontal force. the coeffecient of friction between the mass and table is Î¼1, while that between the table and ground is Î¼2. Mass of block: m Mass of ta ...
replied2008-09-26 21:34:21
• I have not been able to understand Rolling Friction. Could someone make it more clear to me? ...
replied2008-09-26 20:42:09
• an electron is moving along positive X- axis You want to apply a magnetic field for a short time so that the electron mayn reverse its direction and move parallel to the negative X- axis this can be done by applying the magne ...
replied2008-07-23 22:45:57