Recently Active Physics Questions

The amplitude of wave is given by A=c/(a+b-c).Find values of a,b,c for which resonance will occur ...

If a gas is heated at constant pressure,the isothermal compressiblity a) remains constant b) increases linearly c) decreases linearly with temperature d) decreases inversely with temperature ...

An organ pipe is sounded with a tuning fork of frequency 256Hz.When the air in the pipe is at temperature of 15°C,23 beats are heard in 10 seconds.When the tuning fork is loaded with a small piece of wax,the beat frequency i ...

*Image* Source: 200 Puzzling problems [1] ...

*Image* Can anyone please find the center of masses of a uniform hollow hemisphere and of a frustum like shown above? You can take any variable you like. ...

*Image* A small body 'A' is fixed to the inside of a thin rigid hoop of radius R and mass equal to that of body 'A'. The hoop rolls without slipping over a horizontal plane. At the instant when the body is at lowermost positi ...

A heavy mass m is tied through a pendulum in a railway train moving at a constant speed v. The carriage is brought to rest suddenly by a strong but uniform braking. Can the pendulum travel through 180° so that the taut reach ...

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One end of an elastic string of natural length a and force constant λ/a is fixed to a point on a smooth horizontal surface vandvthe other end is attatched to aparticle of mass m lying on the surface. the particle is pulled f ...

Q1. Prove that the 3 internal angle bisectors of a triangle are concurrent. Q2.Prove that 2 external bisectors and 1 internal bisector of a triangle are concurrent. Q3.Prove that 3 altitudes of a triangle are concurrent. Q4.F ...

*Image* . A sphere is rotating between a rough wall and a smooth wedge as shown in the fig. If u is the coefficient of friction between then find the normal reaction between the wall and the sphere. ...

can toppling occur even in absence of friction??? plz explain....... ...

*Image* . A block of mass m is pushed towards a movable wedge of mass nm and height h with a velocity u. All surfaces are smooth. The minimum value of u for which the block will reach the top of the wedge is... a> √2gh b ...

*Image* spring const. = k all surfaces are smooth. u hav to find out the elongation in the spring. I have brought out 2 solutions....tell me which one is right. Soln. A : kx = mg sinθ x= mg sinθ/k Soln. B : Consider the ext ...

Does anyone remember any of the following qs which came in FTSE 09?? 1.this question was about an insect which moved with a constant velocity of a disc rotating given initial and final coordinates. We had to find omega 2. Thi ...

a hot body is placed in a room maintained at lower temperature .np. of photons will increase or decrease.....plz give reasons ...

A uniform chain of mass m hangs from a light pulley, with unequal lengths hanging from two sides of the pulley. The force exerted by the moving chain on the pulley is ....... a> mg b> >mg c> <mg d> may be an ...

2 trans, each wid speed 50 km/h , r headed towards each other on d same track. a bird which can fly at d rate of 100 km/h flies off one train when they r 100km apart and heads directly to other train. on reaching d other trai ...

An easy one... Q.A rod is rotating about center with angular speed w. If the Young modulus of elasticity of rod is Y and length and cross sectional area is l and A respectively. Find the elongation in rod. *Image* ...

A block of ice containing a small air bubble floats in a pond.The ice melts.Does the water level go up,down or stay the same ? Explain. Ans the same question where the air bubble is replaced by a piece of lead. ...

In theory of nos there is a symbol inverted capital E what is that symbol?what is most imp from theory of nos for olympiad ...

This is another problem from an online contest... (This is another of the unsolved problems.. which if not solve.. you should definitely give a good thought) Prague Physics Challenge, 2nd round Falling pen Imagine that you ar ...

Two concentric cylinder have a radius a and b. The charge on the cylinder is +q and -q. Another cylinder of radius (a+b)/2 is introduced between the two. The charge on this cylinder is +q/2. What is the capacitance of the arr ...

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A wave pulse is passing on a string with a speed of 40cm/sec. in the negative x direction. It has the maxima at x=0 at t=0. Where is the maxima located at t=5?? ...

A hot body placed in air is cooled down according to newton's law. The rate of decrease of temperature being K times the temperature difference from the surrounding. Starting from t=0, find the time in which the body will los ...

Can any one plz expalin me wats Centre of mass frame and how to solve problems using it??? ...

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Consider a collection of a large no. of particles , each with speed v. the direction of velocity is randomly distributed in the collection. Show that the magnitude of the relative velocity between a pair of particles averaged ...