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 ...

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(2Ï€ft) is applied to a parallel plate capacit ...

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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 ...

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 ...

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 ...

what is coefficient of restitution ...

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* ...

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 ...

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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 ...

*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?? ...

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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 ...

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 ...

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 ...

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 ...

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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 ...

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*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 ? ...

*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, ...

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 ...

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 ...

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.) ... ...

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 ...

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* ...

"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 ...

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* ...