# Recently Active Physics Questions

• what minimum height should a mirror secured on a wall have for a man to see his reflection full size without changing the position of his head?determine also the required distance between the floor and the lower edge of t ...
replied2009-01-17 08:21:18
• The speed light maybe determined by an electrical circuit using low frequency ac fields only. Consider the arrangement shown in the Fig. (4). A sinusoidally varying voltage V0 cos(2πft) is applied to a parallel plate capacit ...
replied2009-01-17 06:44:46
• GO THRU THIS ONE AND TRY SOLVING IT OUT..... *Image* ...
replied2009-01-17 04:47:56
• *Image* *Image* ...
replied2009-01-17 03:45:58
• FBI accidently got a secret short code. They thought that this was sent by some enemy country agent or a terrorist organization. They tried hard to dechiper this code, and to do so they employed the most talented men at their ...
replied2009-01-16 21:00:44
• A particle of mass 2m is projected at an angle of 45 degree with the horizontal with a velocity of 20 2 m/s. After 1 sec, explosion takes place and the particle is broken into two equal pieces. As a result of explosion one pa ...
replied2009-01-16 19:58:43
• a stream of electrons moving with 3X107m/s gets deflected by an electric field of 18 V/cm normal to their path What is the transverse deflection in travelling through a horizontal direction of 10 cm in the field ...
replied2009-01-16 19:20:55
• what is coefficient of restitution ...
replied2009-01-16 19:06:51
• A uniform chain of length L and mass M is hanging vertically from its ends A and B which are close together.At a given instant the ened B is released.Find the tension at A when B has fallen a distance x(<l) *Image* ...
replied2009-01-16 18:55:26
• An engine using 1 mole of an ideal gas initially at V1 = 33.2 litre and 400 K performs a cycle ABCDA consisting of four steps: (1) an isothermal expansion at T = 400 K to twice its initial volume (AB), (2) cooling at constant ...
replied2009-01-16 07:49:01
• A particle of mass having negative charge q moves along an ellipse around a fxed positive charge Q so that its maximum and minimum distances from fixed charge are equal to r1 and r2 respectively. Calculate angular momentum L ...
replied2009-01-16 04:31:40
• *Image* the cells given in the circuit are 5v each and have internal resistance of 0.2 ohms, then the reading in the ideal volt meter is?? ...
replied2009-01-16 03:45:15
• *Image* ...
replied2009-01-15 21:36:58
• guys help me out... i've just started optics and ma studymaterial has some topics which i've not heard of... So tell me which are the topics there in the iit-jee syllabus??? I'd a look over the brochure but didn't able to get ...
replied2009-01-15 11:57:38
• guys i really wanted a question answered [1] if the orthocentre and circumcentre if a triangle coincide...ij it necessary that the centroid also coincide...[1] and if yes then with whowm....ortho or circummm wud really help m ...
replied2009-01-15 11:09:32
• A locomotive approaching a crossing at a speed of 80 miles per hr sounds a vessel of frequency 400 Hz.When 1 mile frm d crossing there's no wind and the speed of sound in air is 0.2mile per sec.What frequency is heard by an o ...
replied2009-01-15 07:32:44
• consider two lamps with resistance R1 and R2 which are coneeted in parallel R1>R2 if the lamp of resistance R1 now burns out, how will the illumination produced change? will the illumination remain same or decrease or incr ...
replied2009-01-15 05:52:53
• *Image* *Image* ...
replied2009-01-15 05:38:34
• A trolley of mass M placed on a smooth floor, carries two persons each of mass m at the edge.Given velocity of trolley after both men jump off the trolley simultaneously is Va and if they jump one after the other it is Vb(bot ...
replied2009-01-15 05:27:28
• *Image* *Image* ...
replied2009-01-15 05:04:02
• *Image* in the arrangement shown, the ends P & Q of an unstrecthable string move downwards with uniform speed U. pulleys A & B are fixed. find the speed with which mass M moves upwards ? ...
replied2009-01-15 02:25:46
• *Image* sum 22, part (b,c&d) along the string should have a component of the force by the charge...... but the answer is zero, ...
replied2009-01-14 23:08:41
• Two point charges P1and P2 are moving along positive x-axis. Charge and mass of P1 and P2 are (2uc,60ug)and (-5uc,30ug). At particular instant , if the distance of separation is 9mm and the respective speeds are 400ms-1and 13 ...
replied2009-01-14 04:22:50
• a projectile will cover the maximum vertical distance in the minimum time when the angle of its projection with the horizontal is i know the ans is 45° but i am not able to prove it ...
replied2009-01-13 20:42:19
• Q2.) an object is placed somewhere in front of a mirror... and its image is formed somewhere.. magnification = m. now the object is made to lie down on the principal axis. hence find the lateral magnification .. (1 min.) ... ...
replied2009-01-13 20:09:00
• a car 2m long and 3m wide is moving at 10m/s when a bullet hits it in a direction making an angle of inv.tan(3/4) with the car as seen from the ground The bullet enters one edge of the car at the corner and passes out at diag ...
replied2009-01-13 19:34:30
• What is the field at any point inside a solid metallic sphere of uniform positive charge distribution of 1000 C (mm)-3? Radius of metallic sphere = 3000km *Image* ...
replied2009-01-13 19:22:08
• "A thick mirror forms a number of images out of which second one is brightest." i cant get head or tail of the statement can some one explain please ...
replied2009-01-13 05:52:37
• Photons of energy 5e.V are incident on cathode.Electrons reaching the anode have kinetic energies varying from 6e.V to 8e.V.wat is the workfunction of the metal.Electrons r acc through a potential difference of 5V *Image* ...
replied2009-01-13 02:15:59