Recently Active Mechanics Questions

Two masses m and 2m are attached to two ends of an ideal spring and the spring is in the compressed state. The energy of spring is 60 joule. If the spring is released, then A. the energy of both bodies will be same. B. energy ...

in a gamma decay process, the internal energy of a nucleus of mass M decreases, a gamma photon of energy E and linear momentum E/c is emitted and the nucleus recoils Find the decrease in internal energy ...

A uniform rod of length l is pivoted at pt. A.It is struck by horz. force which delivers an impulse J at distance x from pivot.For what value of x , the impulse delivered by pivot is equal to zero?????? ...

a uniform disc of mass m and radius R is projected horizontally with velocity "Vo" on a rough horizontal surface so that it starts off with a purely sliding motion at t=0.After time "to" sec,it acquires a purely rolling motio ...

A metal ring of mass m nd radius R is placed on a smooth horizontal table & is set rotating about its own axis in such a way tht each part of the ring moves with a speed v ...find the tension in d ring???????????? ...

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*Image* P.S the springs are attached to string and x=a ...

A rod of mass 2m and length 2l is bent at its midpoint making 90° angle find the moment of inertia of the system about an axis passing through the point of bent symmetrically and making minimum angle of 45° with the plane o ...

*Image* A rod hinged at one end is released from the horizontal position as shown. When it becomes vertical its lower half separates without exerting any reaction at the breaking point. Then find the maximum angle θ made by ...

*Image* Extension to my question of 04-04-09.........find the velocity of the system after all possible perfectly inelastic collisions all the spheres have equal mass..... they have velocity whose magnitude is written over th ...

The speed of a 1.5*10^4 g navy fighter plane landing on a carrier is reduced 216 km/hr to rest by the plane's brakes and the cable arrester system . The arresting force provided by the plane's brakes is 600 kN . The arresting ...

A uniform bar AB of length 2 m. and mass 5 kg hanging freely frem a froctionless pivot at A is struck by a 25 gm bullet moving with a velocity of 500 m/s and making an angle of 30° with the horizontal . The bullet pierces th ...

*Image* all the spheres have equal mass.....and they undergo perfectly elastic collision amongst each other... they hav velocity whose magnitude is written over the arrows and the direction of their initial velocity is repres ...

"A particle is placed on a rough plane inclined at an angle theta, where tan θ = μ = coefficient of friction(both static an dynamic). A string attached to the particle passes through a small hole in the plane. The string is ...

Given a cylinder which rolls on horz surface.It encounters a long tub (width=wR)filled with liquid of same density as cylinder.Will the cylinder continue to roll just after it comes out of liquid ?? *Image* ...

A weightless rod of length l with a small load of mass m at the end is hinged ar point A and occupies a strictly vertical position, touching a body of mass M.A slight jerk sets the system in motion. Frixtion is neglected and ...

We know that friction between two surfaces is due to the uneven nature of the surface of the bodies. But in case of 2 plane mirrors will there be any friction ????? they have perfectly smooth surfaces. The how can we keep one ...

Q1 A square lamina ABCD (side length=a) mass m is kept on an elastic surface.An impulse J is provided very close to vertex A.Find minimum value of impulse J that can flip the lamina. *Image* will it be done this way ?? Assumi ...

The situation is shown at t=0 At some nstant ,simultaneously two events occur a)Cutting os string joining block and ceiling b)Punching of hole at bottom most point of vessel How will velocity of efflux vary with time ??? 1) * ...

can anyone explain me how to solve problems involving variable mass systems.. except rocket propulsion... please..? ...

a ball of mass m is thrown up with a vel. 10 m/s.and it returns to the hand of the thrower with a vel .of 9 m/s. find the height attained by the ball(take level of hand to be 0 and air resistance to be uniform) ...

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A ball of mass m is dropped on to a floor from a certain height The collision is perfectly elastic and the ball rebounds to the same height and again falls. Find the average force exerted by the ball on the floor during a lon ...

A gun is mounted on a railroad car. The masses of shell gun car is 50m where m is mass of one shell. If the velocity of gun w r t gun in its state before firing is 200m/s What is the recoil speed of the car after the second s ...

During a heavy rain hailstones of average size 1 cm dia falls with a average speed of 20 m/s. Suppose 200 hailstones strike every sq.m of a 10mX10m roof perpendicularly in one sec and assume that the hailstones do not rebound ...

Q1. Assume that the light is monochromatic. Let the no. of photons falling on a surface per unit time be 'n' and I = intensity of light.. Then I\propto n^x where x= _____ Q2. Change in phase when a longitudinal wave reflects ...

*Image* two blocks each of mass M are connected to the ends of a light frame as shown in figure. the frame is rotated about the vertical line of symmetry the length of each side being l.the rod breaks if the tension in it exc ...

*Image* A setup consistomg of 3 identical balls (points) attached to a small massless ring is rotating on a smooth table. it is known that the ring is at rest at the instant shown in the figure. Just now however one of the st ...

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Assertion :In an atwood machine when the masses r in motion , for a heavy rough pulley tension on both side of pulley r different Reason : Acceleration of both masses r different *Image* ...