Home
Class 11
PHYSICS
A block of mass l O kg is kept at the to...

A block of mass l O kg is kept at the top of a rough inclined plane ofi_nclination 60° with the horizontal. The length of the inclined plane is 5 m and the coefficient of sliding friction between the block and the surface is 0.3. What is the work done on the block against the force of friction , when it reaches the bottom? (g`=10m//s^2`)

A

25 J

B

40 J

C

35 J

D

75 J

Text Solution

Verified by Experts

The correct Answer is:
D
For a body sliding down a rough inclined plane, force of friction f`=muR=mumgcostheta`
`:.` Work done=fs`=(mumgcostheta)xxs`
`=0.3xx10xx10xxcos60^(@)xx5`
`=3xx5xx5=75J`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • FRICTIONAL IN SOLIDS AND LIQUIDS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|10 Videos

  • FORCE, WORK AND TORQUE

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|10 Videos

  • MAGNETIC EFFECT OF ELECTRIC CURRENT

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|10 Videos

Similar Questions

Explore conceptually related problems

A block of mass 5 kg rests on a inclined plane at an angle of 30^(@) with the horizontal. If the block just begins to slide, then what is the coefficient of static friction between the block and the surface?

A block of mass 5 kg rests on a inclined plane at an angle of 30^(@) with the horizontal . If the block just begins to slide , then what is the coefficient of static friction between the block and the surface ?

Knowledge Check

  • A block is at rest at the top of a rough inclined plane of inclination 30° with the horizontal. What is the coefficient of kinetic friction between the block and the plane, if the . block slides down with an acceleration of g/5 ?

    A
    0.25
    B
    0.275
    C
    0.325
    D
    0.346

  • A block sliding down on a rough 45^(@) inclined plane has half the velocity it would have been, the inclined plane is smooth. The coefficient of sliding friction between the block and the inclined plane is

    A
    `(1)/(4)`
    B
    `(3)/(4)`
    C
    `(1)/(2sqrt2)`
    D
    `(1)/(sqrt2)`

  • A block sliding down on a rough 45^(@) inclined planes has half the velocity it would have been, the inclined plane is smooth. The coefficient of sliding friction between the the block and the inclined plane is

    A
    `1/4`
    B
    `3/4`
    C
    `1/(2sqrt2)`
    D
    `1/sqrt2`

    • Similar Questions

    Explore conceptually related problems

    A block of mass 10 kg is kept on a fixed rough (mu=0.8) inclined plane of angle of inclination 30^(@) . The frictional force acting on the block is

    A block of mass 10 kg is released from top of rough inclined plane as shown in the figure if coefficient of friction between the block and inclined plane is then total work done on the block by all the forces acting on it till it reaches the bottom s = 10 ms

    A block of mass m slides down a rough inclined plane of inclination theta with horizontal with zero initial velocity. The coefficient of friction between the block and the plane is mu with theta gt tan^(-1)(mu) . Rate of work done by the force of friction at time t is

    A block of mass m is placed on a rough inclined plane of inclination theta kept on the floor of the lift. The coefficient of friction between the block and the inclined plane is mu . With what acceleration will the block slide down the inclined plane when the lift falls freely ?

    A block of mass m slides down a rough inlcined plane of inclination theta with horizontal with zero initial velocity. The coefficient of friction between the block and the plane I mu and theta gt tan^(-1) ( mu) . Rate of work done by the force of friction at time t is

    Home
    Profile