A particle moving with velocity is acted by three forces shown by the vector triangle PQR . The velocity of the particle will :
change acording to the smallest force QR
Two particle A abd B are moving in uniform circular motion in concentric circles of radii with speed respectively . Their time period of rotation is the same . The ratio of angular speed of A to that of B will be :
1 : 1
A mass m is attached to a thin wire and whirled in a vertical circle . The wire is most likely to break when :
The mass is at the highest point
the wire is horizontal
The mass is at the lowest point
Inclined at an angle of 60 degree from vertical
A block of mass 10 Kg is in contact against the inner wall of a hollow cylinder drum of radius 1 m . The coefficient of friction between the block and the iner wall of the cylinder is 0.1 . The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis will be
A body of mass 1 kg begins to move
under the action of a time dependent force
(2ti + 3t2j)N, where i and j are unit
vectors along x and y axis. What power
will be developed by the force at the time
v is obtained by integrating acceleration
a force F=(6i-8j+10k)N produces accelaration of 1m/s^2 in a body. Calculate mass of the body.
Two blocks of masses 50 Kg and 30 Kg connected by a massless string pass over a tight frictionless , pulley and rest on two smooth planes inclined at angles nad reaspectively with horizontal as shown in the figure .If the system is released from rest then find time taken by 30 Kg block to reach the ground
In the given arrangement all surfaces are smooth. What acceleration should be given to the system, for which the
block m2 doesn't slide down?
A block of mass m is placed on a smooth inclined wedge ABC of inclination as shown in the figure. The wedge is given an acceleration 'a' towards the right. The relation between a and for the block to remain stationary on the wedge is
4) a =gtan
Which one of the following statements is incorrect ?
Frictional force opposes the relative motion.
Limiting value of static friction is directly proportional to normal reaction.
Rolling friction is smaller than sliding friction.
Coefficient of sliding friction has
dimensions of length.
Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in radius and the lighter one in radius r. The tangential speed of lighter stone is n times that of the value of heavier stone when they experience same centripetal forces. The value of n is:
The force 'F' acting on a particle fo mass 'm' is indicated by the force-time graph shown below. The change in momentum of the particle over the time interval from zero to 8 s is: