# Recently Active Mechanics Questions

• A stone is dropped into a well and a splash is heard 2.2s later.What is depth of well?? ...
replied2008-12-25 12:18:33
• 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 ...
replied2008-12-25 11:03:06
• 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 ...
replied2008-12-25 10:38:10
• A block of mass 1kg held by a sting is on an inclined plane of inclination 37 degrees. The coeff. of friction (Î¼) = 0.8. Find the tension in the string. ...
replied2008-12-25 00:07:37
• 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 ...
replied2008-12-24 23:58:54
• 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 ...
replied2008-12-24 11:03:49
• 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* ...
replied2008-12-24 02:04:11
• 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. ...
replied2008-12-23 23:56:05
• 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* ...
replied2008-12-23 23:03:49
• 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 ...
replied2008-12-23 20:13:17
• 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* ...
replied2008-12-23 20:00:15
• *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 . ...
replied2008-12-23 14:28:21
• 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 ???? ...
replied2008-12-23 14:21:30
• 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 __________ ...
replied2008-12-23 10:36:42
• 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* ...
replied2008-12-23 10:29:53
• A solid sphere of mass m rolls down a incline plane of height h.Find KErot of sphere. ...
replied2008-12-23 10:18:33
• Show that If a rod is held at an angle Î¸ to the horizontal and released, its lower end will not slip if friction b/w rod and ground is greater than (3sinÎ¸cosÎ¸)/(1+3sin2Î¸). (...DC Pandey) ...
replied2008-12-23 05:24:51
• 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 ...
replied2008-12-23 04:23:21
• 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 sâ€“1. How much time does the ball take to return to his hands? If the lift starts movi ...
replied2008-12-22 22:18:14
• 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( ...
replied2008-12-22 21:11:15
• A small block of mass m is kept on a rough inclined surface of inclination Î¸ 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 ...
replied2008-12-22 12:44:54
• 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) ...
replied2008-12-22 12:31:29
• 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 ...
replied2008-12-22 12:21:11
• 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 ...
replied2008-12-22 11:50:43
• 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 ...
replied2008-12-22 11:29:57
• *Image* find time period of mass 'm'... in 3 minutes... ...
replied2008-12-22 09:27:15
• 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 ...
replied2008-12-22 00:18:08
• 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 ...
replied2008-12-19 08:43:58
• A block of mass m is kept on a rough horizontal floor having coefficient of friction Î¼ 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 ...
replied2008-12-19 08:11:42
• 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 ...
replied2008-12-19 07:43:04