Recently Active Mechanics Questions

A cylindrical pulley of mass M and radius R is connected to another pulley of mass M/2 ,R/2 through a massless string as shown. If sufficient string is wrapped over larger pulley,find the accleration of mass M attached to the ...

A block of mass m and a pan of equal mass are connected by a string going over a smooth light pulley. Initially the system is at rest when a particle of mass m falls on the pan and sticks to it. If the particle strikes the pa ...

A rod OA of mass m and length L hinged at end O can rotate smoothly in vertical plane about horzontal axis passing through O .It is released from a horizontal position as shown. and strikes a block of mass M kept vertically b ...

1. Rolling Question : A sphere S rolls without slipping mving with a constant speed on a plank P.The friction between the upper surface of P and the sphere is sufficient to prevent slipping , while the lower surface of P is s ...

3 solid hemispheres, each of radius (R) are placed in contact with each other, side by side, such that their flat surfaces rest on the rough horizontal ground . a solid sphere of mass(m) is symmetrically placed on the top of ...

*Image* A mass of 1 kg is suspended by a string A . ANother string C is connected to its lower end[ See fig). if a sudden jerk is given to C , then a) the portion AB of the string will break b)the portion BC of the string wil ...

A cube of mass 2kg is held stationary against a rough wall by a force F=40N pass through centre C.Find perpendicular distance of normal reaction between wall and cube from point C.Side of the cube is 20cm. *Image* ...

A rod OA of mass 4 kg is held in horizontal position by a massless string AB as shown in the figure,Length of the rod is 2 m .Find : a.tension in the string b.net force exerted gy the hingre on the rod *Image* ...

*Image* a system consists of two cubes of masses m1 & m2 respectively connected by a spring of force constant k . find the force (F) that should be applied to the upper cube for which the lower one justs lift after the force ...

i still can't figure out the following questions . Please help... 1.A long capillary tube of mass Î gram, radius 2mm and negligible thickness is partially immersed in a liq of surface tension 0.1N/m, The angle of contact =0 a ...

Three identical balls are connected by light inextensible strings with each other as shown and rest over a smooth horizontal table. At the moment t=0, ball B is imparted a velocity. Calculate the velocity of A when it collide ...

Q. A hammer of mass M falls from a height h repeatedly to drive a pile of mass m into the ground. The hammer makes the pile penetrate in the ground to a distance d in single blow. Opposition to penetration is given by? ...

A lift performs the first part of its ascent with uniform acceleration a and the remaining with uniform retardation 2a.If t is the time of ascent,find the depth of the shaft. (a) at2/4 (b) at2/3 (c) at2/2 (d) at2/8 (According ...

Q: A ball hits the floor and rebounds after an inelastic collision. In this case, a) the momentum of the ball just after collision is the same as that before collision. b) the mechanical energy of the ball remains same during ...

Q1. Two ships A and B originally at a distance d = 3 km from each other depart at the same time from a straight coastline. Ship A moves along a straight line perpendicular to the shore while ship B constantly heads for ship A ...

Three sound waves of equal amplitudes have frequencies (v -1), v, (v + 1). They superpose to give beats. What is the number of beats produced per second?? Please give detailed explanation. ...

A particle moves from position {{ar{r}}_{1}}=3hat{i}+2hat{j}-6hat{k} to position {{ar{r}}_{2}}=14hat{i}+13hat{j}+9hat{k} under the action of force 4hat{i}+hat{j}+3hat{k},N . The work done will be ...

A student says that he had applied a force F=-k x on a particle and the particle moved in simple harmonic motion.He refuses to tell whether k is contant or not.Assume that he has worked only with positive x and no other force ...

A heavy, flexible, inelastic chain of length L is placed almost symmetrically onto a light pulley which can rotate about a fixed axle, as shown in the figure. *Image* What will the speed of the chain be when it leaves the pul ...

A time varying force F=2t is applied on a spool.The angular momentum of spool at time t about bottommost pt. is?????????? *Image* ...

Traditionally been weak in this part of mechanics...pulley problems samajh aate they magar usse zyaada nahi. Q. A hinged construction consists of three rhombuses with the ratio of sides 3:2:1 . Vertex A3 moves in the horizont ...

A cylindrical vessel of radius r containing a liquid spins continuously with angular velocity ω. Find the pressure at the radialk diatance r from the axis. Take P1 as atmospheric pressure..... ...

The kinetic enegry of a particle moving along a circle of radius R depends on the distance covered a T=as2,where a is a constant.Find the force acting on the particle as a function s. ...

4 identical balls of radius R and mass m are lying in a gravity free space. The balls are in contact and their centres are forming vertices of a square of side 2R in horizontal plane. One identical ball travelling vertically ...

A sphere of mass m held at a height 2R between a wedge of same mass and a rigid wall,is released from rest.Assuming all the surfaces are frictionless.Find the speed of both the bodies when the sphere hits the ground *Image* ...

A drinking straw of length 3a/2 and mass 2m is placed on a square table of side 'a' parallel to one of its sides such that one third of its length extends beyond the table.An insect of mass m/2 lands on the inner end ...

*Image* A block is dragged on a smooth plane with the help of a rope which moves with velocity v shown in Fig. The horizontal velocity of the block is a)v b) vsinθ c) v/sinθ d) v/cosθ ...

A block is traveling down an inclined plane of inclination θ. The height of the inclined plane is H. What will be the time required to slide down the plane. ...

The horizontal and vertical distances traveled by a particle in time t are given by x = 6t and y=8t-5t^2 . If g=10m/sec^2 , then the initial velocity of the particle is a) 8 m/sec b) 10 m/sec c) 5 m/sec d) zero ...

Why is it that we never consider internal forces while considering a particular system? Explain in detail. ...