Recently Active Mechanics Questions

A small object is at rest on the edge of a horizontal table.It is pushed in such a way that it falls off the other side of the table,which is 1m wide in 2s.Does the object have wheels ?? ...

Q. A horizontally oriented uniform rod AB of mass m=1.4 kg and length lo = 100 cm rotates freely about a stationary vertical axis OO' passing through its end A. the point A is located at the middle of the axis OO' whose lengt ...

*Image* plese tell me how to solve this prob(HCV) Q:find M such thatthe block m appears to be in rest w.r.t. M'.assume wedge angle to be θ ...

Can a billiard ball inside a cube bounce off every wall once and return to its starting point? JUst a puzle for those who are free..... ...

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If a mass is ejected from a system moving with a constant velocity ,in a direction opposite to the system's motion then what will be the direction of the thrust force acting on the system and how to decide the direction? ...

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A horizontal plank having mass m lies on a smooth horizontal surface.A sphere of same mass and radius r is spined to an angular frequency w0 and gently placed on the plank as shown in the figure.If coefficient of friction bet ...

*Image* Mass of the pulley is M.Tension in the rope is T.The radius of the pullry is R.Now the torque due to T is TR; but it is said that this torque will rotate the pulley anti-clockwise and hence it is positive. HOW? ...

Please see the image.... *Image* I cant understand where i hav done the mistake as i am not getting the answer.....plz help ...

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I think everyone has come across this familiar problem: Three snails A, B, C are initially located at the vertices of an equilateral triangle. Starting at t=0, they all move with the same constant speed such that A always poi ...

A horse pulls a wagon of 5000kg from rest against a constant resistance of 90N.The pull exerted initially is 600N and it decreases uniformly with the distance covered to 400N at adistance of 15m from the start.the velocity of ...

A trolley of mass 200kg moves with a uniform speed of 36km/h on a frictionless track.A child of mass 20kg runs on the trolley from one end to the other ,10m away,with a speed of 4 m/s relative to the trolley in a direction op ...

A bolt of mass 0.3 kg falls from the ceiling of an elevator moving down with a uniform speed of 7m/s.It hits the floor of the elevator (length of the elevator =3m) and does not rebound.What is the heat produced by the impact ...

Q- Two cars left place A simultaneously and reached the place B in 2 hrs.The first car traveled half the distance with a speed of 30km/hr and the other half at a speed of 45km/hr.The second car at the same time covered the en ...

These are a few doubts from H.C.verma 1)Can an object be in pure translation as well as in pure rotation? 2)A ball is whirled in a circle by attatching it to a fixed point with a string.Is there any angular rotation of the ba ...

I know these are simple but it's not striking me... Q1- A car moving with constant acceleration covers the distance between two points 180m apart in 6 sec.its speed as it passes the second point is 45m/s.What is its accelerat ...

A block of mass m is kept on a rough inclined plane of incl.θ with the horizontal.the whole system is kept in an elevator which is moving up with constant velocity v.Find the displacement of block in time t.Please explain. ...

*Image* a man is standing in a box on a weing machine as shown , if the weight of box is 30 kg and that of the man is 60 kg , find out the weight of the man shown by the machine when he just manages to keep the sysytem in equ ...

A sphere of weight W=100 N is kept stationary on a rough inclined plane by a horizontal string AB as shown in the figure.Find- a.tension in the string . b.force of friction on the sphere and c.normal reaction on the sphere by ...

A man can swim directly across a stream of width 100m in 4 minutes when there is no current and in 5 min. when there is current.the velocity of current is? ...

PG.134 Q.6 ...

The 50kg homogenous smooth sphere rests on the 30. incline A and against the smooth vertical wall B.Calculate the contact forces at A and B. *Image* ...

*Image* what significance does the horizontal spacing in this question have?(i mean regular and irregular spacing) also please give the answer to part c with explanantion. ...

*Image* the book says ans to part (b)is unanswerable but i am getting an answer ...

A ball of mass m is moving horizontally with a constant velocity v towards a rigid wall.The wall is moving perpendicular to the direction of motion of ball with a constant speed u. Assuming elastic collision between the ball ...

A simple pendulum consists of a bob of mass 'm' attached to a string of breaking strength double the weight of the bob. The bob is released from rest vertically when the string is horizontal. The string breaks when it makes a ...

*Image* ans. as far as i can think should be positive..........but answer given is negative,,,,,,,,,,,,,,wat's right??????? ...

a conveyor belt making an angle of pi/6 with the horizontal moves up with a speed of 3m/s.A box is gently placed on it.find how far the box will move on the belt before coming to rest,if the coffecient of friction between the ...