Recently Active Mechanics Questions

1.A body of mass m is slowly hauled up the hill by a force f which at each point was directed along a tangent to the trajectory .Find the work performed by this force , if the height of the hill is h and length of its base is ...

1) Internal forces can change the linear momentum of portion of the system, but they can't change the the total linear momentum of the entire system. WHY? 2)How can the centre of mass of a body be at a point outside the body, ...

(1) A monkey of mass 15kg is climbing on a rope with one end fixed to the ceiling.If it wishes to go up with an acceleration of 1m/s2,how much force should it apply to the rope?If the rope is 5m long and the monkey starts fro ...

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Q1: A long, thin, pliable carpet is laid on the floor. One end of the carpet is bent backand then pulled backwards with constant unit velocity, just above the part of the carpet which is still at rest on the floor. *Image* ...

a uniform chain of mass m and length L is suspende so that its lower end just touches a smooth inelastic inclined plane with angle=45 .when it is released find the total impusle on the plane and the the force exerted by the c ...

*Image* A Projectile is fired from the left side as Shown in figure at an angle 'Alpha' so that It just grazes or passes the Four vertices of the given hexagon. Find the ratio of the maximum and minimum Velocities of the Proj ...

A particle is projected vertically upwards from a point A on the ground. It takes time t1 to reach a point B but it still continues to move up. If takes further t2 time to reach the ground from point B. Then find the height o ...

*Image* find the acceleration of the 1 kg mass!! :D ...

*Image* the net force acting on the particle shown if figure is: 1. m a (vector) 2. F(vector) 3. F(vector) + m a (vector) 4. F(vector) - m a (vector) ...

1.select the correct alternatives (a)Work done by the friction is always zero. (b)Work down by the kinetic friction can be positive (c)Kinetic energy of the system can not be increased without applying any external force (d)W ...

a spotlight S rotates in a horizontal plane with a constant angular vel. of o.1 rad/s . The spot of light P moves alsong the wall at a distance of 3 m .What is The vel. of the spot P when angle is 45? *Image* Q2 . on friction ...

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Two children stand on a large, sloping hillside that can be considered as a plane. The ground is just sufficiently icy that a child would fall and slide downhill with a uniform speed as the result of receiving even the slight ...

CAN ANYONE SOLVE THE FOLLOWING: ∫ x/dx SORRY EVERYONE MY MISTAKE I ADDED INTEGERAL IN PHYSICS............... BUT PLEASE SOLVE THIS PROBLEM ...

*Image* FIND VELOCITY OF BLOCK AT THE MOMENT SHOWN IN FIGURE. (speed u1 and u2 are constant. give your ans. with respect to coordinate system shown in figure) ...

Q. In a uniform gravitational field of gravitational acceleration g', two particles move horizontally with initial velocities u1=3m/s and u2=4m/s in a direction opposite to each other. Find the distance of separation and time ...

torque = dL/dt this expression is valid only if the origin from which it is calculated is an inertial frame . why???? ...

1)The torque of the weight of any body about any vertical axis is 0. Is it always true? 2)A sphere rolls on a horizontal surface. Is there any point of the sphere which has a vertical velocity? 3) When several forces acts on ...

A particle starting frm rest moves in a st. line with acc. as shown in the a - t graph . Find the distance in m travelled by the particle in the first four seconds frm start of its motion. *Image* ...

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a uniform rod of mass 'm' and length '5a' is free to rotate and hinged at point 'P' point P is at a distance of 'a' from one end.a ball of mass '2m' strikes the rod with velocity 'v' at point 'q'.q is at a distance of '2a' fr ...

a bomb bursts at t=0 and the small pieces fly off in every direction.... a man is standing at a distance of 30 m frm the place where this bomb blast occurs if the velocity of all the pieces vary upto 30 m/s (max vel. is 30 m/ ...

Q the resonance length obtained in an exeriment with resonance column tube was 27cm with a fork of freq. 300Hz. If the velocity of sound is 330m/s at the temp of laboratory, the second resonance length and end correction are_ ...

how much time does a projectile take to reach half of its greatest height?? ...

a particle is performing simple harmonic motion along x axis with amplitude 4 cm and time period 1.2 s. The min. time taken by particle to move from x=+2 cm to x=+4 cm and back again is_________ ...

we know that friction can not propose motion, its just opposes it... is the same true for frictional impulse as well?? say if a body is moving in +ve x - axis nd a frictional impulse acts on the body towards left, then under ...

PLEASE FOLLOW THE LINK TO SEE THE PROBLEM.HERE IN THE LINK THE LINK GIVEN FOR THE ACTUAL IMAGE DOES NOT WORK.PLEASE GIVE ME THE SOLUTION OF THE PROBLEM AND THE NEW ACTUAL LINK OF THE IMAGE GIVEN IN THE QUESTION.PLEASE SOMEBOD ...

A particle is projected with velocity u at an angle q with the horizontal . Find the radius of curvature of the parabola traced out by the particle at the point where velocity makes an angle q/2 with the horizontal. plzz give ...

a force P act on body of mass 'm' intially at rest and intiates its vertical motion at t=0 .the force decreases at uniform rate and is proportional to the vertical displacement of body.Find the velocity of the body at a heigh ...