Recently Active Mechanics Questions

a particle moving with uniform retardation covers three successive equal distance .the average velocity during the first and the third parts of the journey being 20m/s and 12m/s respectively .determine the average velocity in ...

Two inclined planes OM and ON having inclinations 30° and 60° respectively with the horizontal ground, intersect each other at O lying on the ground. A particle is projected from point A( lying at height H above the ground) ...

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A CUBICAL BLOCK OF WOOD OF EDGE 3CM FLOATS IN WATER.THE LOWER SURFACE OF THE CUBE JUST TOUCHES THE FREE END OF A SPRING FIXED AT THE BOTTOM OF THE POT.FIND THE MAXIMUM WEIGHT THAT SHOULD BE KEPT ON THE BLOCK TO PREVENT IT FOM ...

*Image* hey guys can ne1 help me wid this ? Its an hc verma prob n the answer is not coming right. the pulley has radius r and moment of inertia I n u r reqd 2 find the accn of da system. hcv says tht it is Mg/(m+M+I2/r). my ...

An astronaut is approaching the moon .He sends out a radio signal of frequency 5000MHz and the frequency of echo is different from that of the original frequency by 100KHz.His velocity of approach with respect to the moon is ...

Imagine I am running with a velocity "v". So my kinetic energy wud be E=1/2mv2. Now according to Einstein, we know that E=mc2. Now equating both, we get 1/2mv2=mc2 ==> v=√2c tht means im even faster than light........... ...

a mass lying on an inclined plane of inclination θ is connected to an equal mass ,hanging vertically ,through a massless string , passing over a frictionless pulley. find the limits of θ, in terms of angle of friction β fo ...

the angular speed of rotation of the earth about its axis in degrees per hour is a) 7.27x10-5 b)4.17x 10-3 c)0.1 d)15 ...

Q.1 for small osscillations find the angular frequencyof the system.. ANS. ω=b√k/c√m Q.2 a ball is a solid sphere of radius r n is in pure rolling on M.find the period of oscillation . ANS. T= 2π√(1+μ2)(R-r)/√mgr2 ...

There are two tanks of same height h3, and pressure in both the tanks are maintained at p1 and p2 respectively, where the liquids are filled upto h1 and h3., there is a pipe connecting the two tanks from which the liquid come ...

there are two concentric bodies of same mass one sphere of radius R and other concentric shell with radii R . the outer shell has a tiny hole in it so that samll particle can penetrate it . A small particle of mass m is relea ...

A rope of length L and mass M is being pulled on a rough horizontal floor by a constant horizantal force F=Mg.The force is acting at one nd of the rope in the same direction as the length of the rope .Te coefficient of kineti ...

A particle moves along the x axis, so that its potential energy U depends on its position coordinate x as U(x)=A|x|^n where A is a positive real and n>0. How will the time period of oscillations depend on the total mechani ...

the extension in a string obeying hooke s law is x .the speed of sound in stretched string is v .if extension is increased to 1.5 x then speed of sound ll be a)1.22v b).61v c)1.5v d)o.75v ...

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A particle is moving with a velocity \overrightarrow{\mathbf{v}_0} when starting at t=0, a constant force starts to act on it. As a result, at t=t0, its speed becomes \dfrac{v_0}{2} , and at t=2t0, its speed becomes \dfrac{v_ ...

A spherical ball in hung in a string of length l and is kept in a car moving wid a velocity v. The car suddenly stops and the ball moves in a circular path. If T is the tension @ the highest pt. is twice the wt. of the ball, ...

we know viscous force is 6 (pi)nrv so do we ve viscous force acting b/w layers even if there is no relative motion ...

q if a deforming force is applied to the rubber n it is suddenly removed wat ll happen to energy /ll it be absorbed or released while regaining its shape (rubber is perfectly elastic) ...

q1 when a glass capilliary tube is dipped at one end of the water .water rises in the tube .the gravitational potential energy is increased .is it a violation of conservation of energy? q2 if a mosquito is dipped in water n r ...

in case of a soap film it s said tht surface tension act at exactly two surfaces cud someone elaborate this thing . i m unable to visualize the things ...

when a metal wire elongates by hanging a load on it , the gravitational potential is decreased then a)this energy completely appears as increased kinetic energy of the block b)this energy completely appears as incresed potent ...

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the contact angle b/w pure water n pure silver is90°if capillary tube made of silver is dipped at one end in pure water ,llwater rise in capilliary ...

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an interstellar explorer discovers a remarkable planet made entirely of uniform compressible fluid of density ρ.the radius of the planet is `r` and the gravity at its surface is `g`. wats the pressure at the centre of the pl ...

HCV pg 131,, Obj-1 Q.10 ... Is the answer correct .. Shouldnt it be (d) ??? ...

a tennis ball and tennis racket are tied together by a massless inextensible string. the combination is thrown through air so that the tennis racket tumbles. as the racket tumbles,it sometimes pulls the string taut, while at ...