Recently Active Mechanics Questions

a water bucket attached to a rope is spun in a vertical radius `r`. suppose the bucket has mass `m` and that the bucket can be aprroximated as a point mass at the end of the rope. the rope breaks when the bucket is moving ver ...

a jug contains 15 glasses of juice. when u open the tap at the bottom, it takes 12 secinds to fill a glass with juice. if u leave the tap open, how long will it take to fill the ramaining 14 glasses and thus empty the jug ? ...

a ship sailing from sea into a river sinks X mm and on discharging the cargo rises by Y mm.on proceeding again into the sea, the ship raises by Z mm. assuming ship sides to be vertical at water line, find the specific gravity ...

post the solution of hcv-1 pg-115 q.21(b) ...

post the solution of hcv-1 pg-115 q.no.22(b),(c),(d) ...

y friction increases on over-polishing a surface ??? ...

*Image* ok.....no prob. of lack of HCV.i am discussing the concept i m having doubt. plz tell the horizontal forces acting on any one of the boy ...

5. If x, n and a denote the displacement, the velocity and the acceleration of a particle executing simple harmonic motion of time period T, then, which of the following does not change with time ? (1) a2T2 + 4p2n2 (2) aT/x ( ...

*Image* plz tell the horizontal forces acting on any one of the boy ...

1) It has been calculated tat the force of attraction bet the moon and the sun is twice as tat of moon wit the earth. Then why does the moon not revolve around the sun? 2)Suppose the moon and sun are on the same side of a par ...

Two swimmers can swim 10m/s and 12 m/s in placid water A river is flowing at the rate of 15m/s a) What is the minimum time difference for them to cross the river? b) If both cross the river in the same time, what is the minim ...

is it so that the whether we write units of a quantity as either m/s2 or rad2m/s2 ...bothe are same. is it so??????? ...

in HCV(circular) exercise q.no.23 why don we take tension on the kids ...

SOLVE HCV-1 PG-115 Q.19(C) ...

*Image* length of the rod =2l mass=M ant hit the rod with V=3m/s at a distance 2l/3 from the string T2 , which string will broken???? ...

A steel wire of diam...d , area A and length 2l is clamped firmly at two points a and b which are 2l apart and in the same plane.A body of mass m is hung from the middle point of wire such that the middle point sags by x lowe ...

An ice piece is floating in a vessel containing water, with in ice piece on metal piece also exist. Given that density of metal piece is greater than density of water, when ice melts completely then initial level of water in ...

A particle is moving along x-axis as ; where x is in m, t in second, a = 1; b =- 3, c = 2, distance cover by particle from t = 1 to t = 2, (A) 0.5 m (B) zero (C) 2 m (D) None ...

No work is done by a force on an object if (a) the force is always perpendicular to its velocity (b) the force is always perpendicular to its acceleration (c) the object is stationary but the point of application of the force ...

a spool consists of a cylindrical core and 2 identical heads. the core rolls without slipping along a rough horizontal block with a constant velocity `v`. the radius of the core is `r` and that of the heads is `R`. what insta ...

A 2 kg block slides on a horizontal floor with a speed of 4m/s. It strikes a uncompressed spring, and compresses it till the block is motionless. The kinetic fricion force is 15 N and spring constant is 10,000 N/m. The spring ...

A radius vector of a particle varies with time r=at(1-αt) where a is a constant vector and α is a positive quantity The time interval Δt taken by the particle to return to the initial points, and the distance s covered dur ...

a massive sphere is fitted into a light rod. when will the rod fall faster; is it is placed vertically on end A or end B ?the end of the rod on ground des not slip *Image* ...

When u lift a box from the floor and put it on an almirah the potential energy of the box increases,but there is no change in its kinetic energy. Is it a violation of the conservation of energy ? ...

your xamination last for 3.5 hrs hw long will an observer movin at v=.8c ..........say it last ?? ...

Tell me why this is said?---explain "In case of stable equilibrium,the centre of mass goes higher on being slightly displaced.For unstable equilibrium it goes lower and for neutral equilibrium it stays at the same height." ...

Can kinetic energy of a system be increased without applying any external force on the system ?? ...

A book is lifted from the floor and is kept in an almirah.One person says that the potential energy of the book is increased by 20J & the other says it is increased by 30 J . Is one of them necessarily wrong ? ...

a boat moves wid speed 5km/h wrt water in starigh river flwoin wid a speed 3km/h n havin width 1km : hw long will d boat take to make a round trip across d river ...

*Image* Consider the situation shown in the figure.Both the pulleys and the string are light and all the surfaces are smooth. (a)Find the accn of 1kg block. (b)Find the tension in the string. ...