Recently Active Mechanics Questions

A stone is dropped into a well and a splash is heard 2.2s later.What is depth of well?? ...

a stick of length l lies on horz .table.It has mass M and is free to move any way on the table.A ball of mass m moving perpendicularly to the stick at a distance d from the centre with speed v collidesw elasticaly. What quant ...

A bead can slide on straight wire and a particle of mass m can is attached to the bead by a light string of length l.The particle is held in contact with the wire with the string taut and then it is let fall.If the bead has m ...

A block of mass 1kg held by a sting is on an inclined plane of inclination 37 degrees. The coeff. of friction (μ) = 0.8. Find the tension in the string. ...

There is a parabolic shaped bridge across a river of width 100m. The highest point of the bridge is 5m above the level of the banks. A car of mass 1000kg is crossing the bridge at a constant speed of 20m/s. Find the force exe ...

Two point masses m1 and m2 are connected by a spring of natural length l.The spring is compressed such that two point masses touch each other and then they are fastened by a string.Then system is moved with velocity v along t ...

A ball of mass m and radius r rolls along a circular path of radius R,Its speed at the bottom os path is v0 Find the force of the path on the ball as a function of theta *Image* ...

A disc is placed on ground.Friction coeffiocient is @.What is min force reqd to move the disc if it is applied at the bottom most pt. ...

The disc of radius R is confined to roll without slipping at A and B .If the plates have velocitites as shown,determine angular velocity of disc..... Ans=3v/2R *Image* ...

A uniform rod of mass m and length l rests on a smooth horizontal surface.One of the ends of the rod is struck in horizontal direction at right angles to the rod.As a result the rod attains a velocity v.Find the force with wh ...

two forces F1 and F2 are applied on spool of mass M and moment of inertia I about an axis passing from centre of mass.Find the ratio F1/F2 so that force of friction is zero. Given I<Mr2 *Image* ...

*Image* A ball is thrown towards a floor with speed u. The coefficient of restitution between floor and ball is "e".The speed with which ball rebounds is . ...

A cast iron column has internal diameter of 200mm .What should be the minimum external diameter so that it may carry a load of 1.6 MN without the stress exceeding 90N/m^2 ???? ...

The conducting concentric hollow spheres A and B have radii a and b respectively with A inside B.Their common potential is V . A is now given some charge such that potential becomes zero.The potential of B is __________ ...

A ring of radius R rolls on horz. ground with linear speed v and angular speed omega.For what value of theta the velociy of pt. P is in vertical direction (v<omega(R)) *Image* ...

A solid sphere of mass m rolls down a incline plane of height h.Find KErot of sphere. ...

Show that If a rod is held at an angle θ to the horizontal and released, its lower end will not slip if friction b/w rod and ground is greater than (3sinθcosθ)/(1+3sin2θ). (...DC Pandey) ...

a whel consists of a circular disc of radius 'a' with four circular holes, each of radius a/4. the centres of the holes form a square and each centre is at a distance a/2 from the centre of the disc. if m is the mass ...

3.24 A boy standing on a stationary lift (open from above) throws a ball upwards with the maximum initial speed he can, equal to 49 m s–1. How much time does the ball take to return to his hands? If the lift starts movi ...

3.28 The velocity-time graph of a particle in one-dimensional motion is shown in Fig. 3.29 : *Image* Which of the following formulae are correct for describing the motion of the particle over the time-interval t1to t2: (a) x( ...

A small block of mass m is kept on a rough inclined surface of inclination θ fixed in an elevator. The elevator goes up with the uniform velocity v and the block does not slide on the wedge. The work done by the force of fri ...

a ball is dropped from a height. if it takes 0.200s to cross the last 6.00m before hitting the ground , find the height from which it was dropped ..(take g=10) ...

A chain of length l and mass m lies on the surface of smooth sphere of radius r > l with one end tied to the top of the sphere.(a) Find the gravitational potential energy of the chain with reference level at the centre of ...

Two masses m2 and m3 are connected by a spring of spring constant k and are placed on a frictionless horizontal surface. Initially the spring is stretched through a distance x when the system is released from rest. Find the d ...

Consider two observers moving with respect to each other at a speed v along a straight line. They observe block of mass m moving at a distance l on a rough surface. which of the following quantities will be same as observed b ...

*Image* find time period of mass 'm'... in 3 minutes... ...

A SMOOTH SPHERE of radius R is made to translate in a straight line with the constant accl. a . A particle kept on the top of sphere is released from there at o velocity with respect to the sphere . Find the speed of the part ...

The system is released from rest from the position show in thediagram If A and B have mass m and M respectively and all surfaces are smooth , then the normal reaction between A and B is assume that string and pulley are massl ...

A block of mass m is kept on a rough horizontal floor having coefficient of friction μ A constant horizontal force F is applied on the block towards right due to which it is moving with a constant acceleration a.Free body di ...

A force of 100 N is applied on a stationary block of mass 3kg as shown in figure. I f the coefficient of frictioon between the surface and the block is 0.25 what is the magnitude anddirection of frictional force what is the m ...