Home
Class 11
PHYSICS
Block A and B shown in the figure are co...

Block `A and B` shown in the figure are connected with a bar of negligible weight. `A and B` each has mass `170 kg` , the coefficient of friction between `A` and the plane is `0.2` and that between `B` and the plane is `0.4 (g = 10 ms_(-2))`

What is the force acting on the connecting bar?

A

`140 N`

B

`100 N`

C

`75 N`

D

`125 N`

Text Solution

Verified by Experts

The correct Answer is:
A
`a = ((m_(A) + m_(B)) g sin theta - f_("total"))/(m_(A) + m_(B))`
`= (1596 - 900)/(340) = 2.1 m//s^(2)`

`F =` force on connecting bar
`m_(A) g sin theta - F - (f_(A))_(max) = m_(A)a`
`:. F = m_(A) g sin theta - (f_(A))_(max) - m_(A)a`
`= 170 xx 10 xx sin 28^(@) - 300 - 170 xx 2.1`
`= 141 N`
Promotional Banner

Topper's Solved these Questions

  • LAWS OF MOTION

    DC PANDEY|Exercise Subjective Question|27 Videos

  • LAWS OF MOTION

    DC PANDEY|Exercise example|86 Videos

  • LAWS OF MOTION

    DC PANDEY|Exercise Objective Question|32 Videos

  • KINEMATICS 1

    DC PANDEY|Exercise INTEGER_TYPE|15 Videos

  • LAWS OF THERMODYNAMICS

    DC PANDEY|Exercise Level 2 Subjective|18 Videos

Similar Questions

Explore conceptually related problems

Block A and B shown in the figure are connected with a bar of negligible weight. A and B each has mass 170 kg , the coefficient of friction between A and the plane is 0.2 and that between B and the plane is 0.4 (g = 10 ms_(-2)) What is the total force of friction between the blocks and the plane?

Find the value of friction forces between the blocks A and B and between B and ground. ( Take , g=10 ms^(-2) )

A body of mass 2 kg is placed on rough horizontal plane. The coefficient of friction between body and plane is 0.2 Then,

Block A and B of masses 5 kg and 10 kg are placed as shown in figure. If block A is pulled with 50 N. Find out acceleration of the A and B. If coefficient of friction between A and B is 0.5 and between B and ground is 0.4.

As shown in figure, A is a man of mass 60 kg standing on a block B of mass 40 kg kept on ground. The coefficient of friction between the feet of the man and the block is 0.3 and that between B and the ground is 0.2 . If the person pulls the string with 125 N force ,then

Blocks A and B in the Fig are connected by a bar of negligible weight .Mass of each block is 170 kg and mu_(A) = 0.2 and mu_(B) = 0.4 where mu_(A) and mu_(B) are the coefficient of limiting friction between bloock and plane calculate the force developed in the bar (g = 10 ms^(-2))

Two blocks of masses 4 kg and 2 kg are in contact with each other on an inclined plane of inclination 30^(@) as shown in the figure . The coefficient of friction between 4 kg mass and the inclined plane is 0.3 , whereas between 2 kg mass and the plane is 0.2 . find the contact force between the blocks .

Blocks A, B and C are placed as shown in Fig and connected by the rops of negligible mass . Both A and B weigh 25.0 N each , and the coefficient of kinetic friction between each and the surface is 0.35 blocks C descends with constant velocity . a. Draw two separate free- body diagrams showing the forces acting on A and B b. Find the tension in the rope connecting blocks A and B c. What is the weight of blocks C? d. If the rope connecting A and B were cut, what would be the acceleration of C?

Blocks A and B of masses 5 kg and 10kg are placed as shown in figure. If block A is pulled with 50 N. Find out acceleration of the A and B. if coefficient of friction between A and B is 0.5and between B and ground is 0.4.