Home
Class 11
PHYSICS
In the diagram shown, the blocks A, B an...

In the diagram shown, the blocks A, B and C weight, 3kg, 4kg and 5kg respectively. The coefficient of sliding friction between any two surface is 0.25. A is held at rest by a massless rigid rod fixed to the wall while B and C are connected by a light flexible cord passing around a frictionless pulley. Find the force F necessary to drag C along the horizontal surface to the left at constant speed. Assume that the arrangement shown in the diagram, B on C and A on B, is maintained all through. `(g=9.8m//s^2)`

Text Solution

Verified by Experts


If 'C' moves with constant speed
`a_(c) = 0`
`F - T_(0) - f_(2)- f_(3) = 0`
`-f_(1) + T_(0) - f_(2) = 0`
`T = f_(1)`
`f_(1) = (3)/(4)g , f_(2) = (7)/(4) g , f_(3) = (15g)/(4)`
Solving ` " " F = 8` g N
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • FRICTION AND CIRCULAR MOTION

    GRB PUBLICATION|Exercise OBJECTIVE QUESTIONS ( only one choice is correct )|80 Videos
  • FRICTION AND CIRCULAR MOTION

    GRB PUBLICATION|Exercise More than one correct|18 Videos
  • FRICTION AND CIRCULAR MOTION

    GRB PUBLICATION|Exercise Comprehension type|11 Videos
  • FORCE AND NEWTONS LAWS OF MOTION

    GRB PUBLICATION|Exercise Comprehension|12 Videos
  • MOTION IN A STRAIGHT LINE

    GRB PUBLICATION|Exercise Comprehension type Queston|14 Videos

Similar Questions

Explore conceptually related problems

Block A in figure-2.207 weights 2.7N and block B weighs 5.4 N the coefficient of kinetic friction between all surfaces is 0.25. Find the magnitude of the horizontal force F necessary to drag blocks to the left at constant speed if A and B are connected by a light, flexible cord passing around a fixed frictionless pulley

Block A as shown in figure weight 1.40 N and block B weight 4.20 N The coefficient of kinetic friction between all surface is 0.30 Find the magnitude of the horizontal force necessary to drag block B to the left at constant speed if A and B are connected by a light , fiexible cort passing around a fixed , frictionless pulled.

Knowledge Check

  • Block A as shown in Fig weighs 2.0 N and block B weighs 6.0 N The coefficient of ikinetic friction between all surface is 0.25 Find the magnitude of the horizontal force necessary to drag block B to the left at constant speed if A and B are connected by a light , flxeible cord passing around a fixed, frictionless pulley

    A
    `2 N`
    B
    `3N`
    C
    `5N`
    D
    `6 N`
  • M_(A) = 3 kg ,M_(B) = 4 kg ,M_(C) = 8 kg . Coefficient of friction between any two surface is 0.25 pulley is frictionless and string is massless .A is connected to wall through a massless right rod.

    A
    value of `F` to keep `C` moving with constant speed is `80 N`
    B
    value of `F` to keep `C` moving with constant speed is `120 N`
    C
    if `F is 200 N` then acceleration of `B` is `10 m//s^(-2)`
    D
    to slide `C` towards left ,`F` should be at least ` 50 N` (Take `g = 10m//s^(-2))`
  • Three blocks A , B and C of masses 4kg , 2kg and 1kg respectively are in contact on a frictionless surface, as shown. If a force of 14N is applied on the 4kg block, then the contact force between A and B is.

    A
    `2N`
    B
    `6N`
    C
    `8N`
    D
    `18N`
  • Similar Questions

    Explore conceptually related problems

    Three blocks A , B and C of masses 4kg,2kg and 1kg respectively, are in contact on a frictionless surface as shown. If a force of 14N is applied on the 4kg block, then find the contact force between A and B.

    Three blocks are placed as shown. The coefficient of friction between any two surfaces is also as given in the diagram. Find the acceleration of the 1kg block at the instant when a force of 50N is applied on 5kg block.

    Two masses 40kg and 30 kg connected by a massless string passing over a frictionless light pulley as shown in the figure. The tension ( almost ) in the string will be : ( All surfaces are frictionless)

    On the figure shown two blocks each of mass 2 kg are connected though a massless inextensible string, which posses over a frictionless pulley. The coefficient of friction between any two surface is mu=0.1 . Find the acceleration of the blocks.

    Two forces act on a 4.5 kg block resting on a frictionless surface as shown in the given figure. What is the magnitude of the horizontal acceleration of the block ?