Recently Active Physics Questions

A spring mass system is held at rest with the spring relaxed at height H above the ground.Determine min. value of H so that given system has tendency to rebound after hitting the ground. Given coeff of restitutuion between m2 ...

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A thin hollow equiconvex lens silvered at the back converges a parallel beam of light, at a distance of 0.2m in front of it. Where will it converge the same light, if filled with water (µ = 4/3). ...

wat is surface tension is it netforce acting per unit length can u please show me the force acting on a thin blade when placed it on the surface of the water please explain the excess pressure inside the air bubble and an air ...

a very broad elevator is going up vertically with a constant acceleration of 2m/s^2 .At the instant when its velocity is 4m/s a ball is projected from the floor of the lift with a speed of 4m/s relative to the floor at an ele ...

A ball of mass m moving with speed v makes head on collision with identical ball at rest.The KE of the balls after collision is 3/4 of original KE.Calculate e. ...

FInd the moment of inertia of hollow cone of mass m,height h and apex angle 2@ about the central axis of symmetry. ...

Two blocks mass m and 2m are kept on smooth horz surface and connected to each other using spring of "k".Initially spring is unstretched.A constant horz. force F applied to heavier block .Suppose at time t , displacem ...

Two equal spherical bubbles(radius=a) coalease to form a spherical bubble of radius b.If P is atmospheric pressure,then the surface tension of bubble is???????? ...

A particle moves from rest at A on the surface of a smooth circular cylinder of radius R .At B it leaves the cylinder.The equation relating alpha and beta is?? *Image* ...

Assume that the centre of mass of a boy crouching in a little swing has been raised to 1.2m.The boy has his centre of mass at 3.7m from the pivot of the swing while he is in crouched position.The swing is released from bottom ...

A tube of length L contains a gas at temperature T. One end of the tube is closed and the other end is open. A small speaker producing sound of variable frequency is placed at the open end. The frequency of the speaker is inc ...

A depletion layer looks like what is given below, right? *Image* So won't the positive ions in n junction attract the free electrons in n junction and negative ions in p junction attract holes from the p junction? ...

Why does hight dopant concentration lead to small depletion layer and low dopant concentration lead to large depletion layer? [7] ...

HC VERMA Friction 28 ...

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A uniform rod length L and mass m2 is pivoted at one end, to its other end is fastened a uniform disk of mass m1 and radius b. Find the angular acceleration of the system just after it is released from the position shown. *Im ...

How many images are formed when this lens is used? No portion of the lens is opaque [4] *Image* ...

*Image* A thin ring made of a magnetic material of permeability has a mean diameter d and supports a winding of N turns. The crosssectional area of the ring is equal to S. The ring has a cross-cut of width b such that b < ...

A small ring of mass `m` is threaded on a horizontal smooth rod which is rotating about its end with constant angular velocity `ω` . The ring is initially located at the axis of rotation.When the distance of the ring from th ...

3 particles of mass m lie on a equilateral triangle of side=a . What is the minimum initial velocity to be given to each particle such that they move in a circle with their seperation = initial seperation .Also find t ...

A Glass Slab ( refractive index=μ ) of height "h" is silvered at bottom surface. There is an air bubble "d" distance below the top surface. The observer is vertically above the bubble. The apparant distan ...

*Image* Show that if a uniform heavy right circular cylinder of radius `a` be rotated about its axis, and lais gently on two tough horizontal rails at the same level and distance 2asinβ apart so that the axis of the cylinder ...

*Image* Three particles A,B,C of mass `m` each are joined to each other by massless rigid rods to form a equilaterall triangle of side `a`.Another particle of mass `m` hits `B` with a velocity v0 directed along BC as shown. T ...

A diwali cracker known as sudarshan chakra works on the principle of thrust. Consider such a toy the centre of which is hinged.the initial mass of the toy is M0 and the radius is R. The toy is in the shape of a spiral the tur ...

One end of a long metallic wire of length L is tied to the ceiling .the other end is tied to a massless spring K,a mass m hangs from the free end of the spring ,cross area and youngs modulus of rod are A and Y,find time perio ...

*Image* VA= 5 M/S downwards VB=10M/S downwards find the velocity of C? ...

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Can anyone please explain what the constraint equation is? ...

k luk at this: for an equiconvex lens, R=2f......(1) Also by lens makers formula, 1/f= (μ-1) [1/R + 1/R] = (μ-1)[2/R] = (μ-1)[2/2f] = (μ-1)[1/f] => (μ-1) = 1 i.e μ=2 !!!!!! what was my ...