Home
Class 12
PHYSICS
Find the ratio of work done by gravity o...

Find the ratio of work done by gravity on the block under the two conditions. Assume `mu = 0` between block and plane.

A

`1:2`

B

`2:1`

C

`1:1`

D

`alpha : beta`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Similar Questions

Explore conceptually related problems

A block of mass 10 kg slides down on an incline 5 m long and 3 m high. A man pushes up on the ice block parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and the incline is 0.1. Find : (a) the work done by the man on the block. (b) the work done by gravity on the block. (c) the work done by the surface on the block. (d) the work done by the resultant forces on the block. (e) the change in K.E. of the block.

A block of mass m is kept over another block of mass M and the system rests on a horizontal surface. A constant horizontal force F acting on the lower block produces an acceleration (F)/(2(m+M)) in the sytem. The two blocks always move together. Consider displacement d of the system. a. Find the work done by friction on bigger block. b. Find the coefficient of kinetic friction between the bigger block and the horizontal surface. c. Find the frictional acting on the smaller block. d. Find the work done by the force of friction on the smaller block by the bigger block. e. Find the work done by static friction on bigger block.

A cord is used to vertically lower an initially stationary block of mass M at a constant downward acceleration of g/4. When the block has fallen a distance d, find (a) the work done by the cord's force on the block, (b) the work done by the graviational force on the block, (c) the kinitic energy of the block, and (d) the speed of the block.

A block of mass 4kg is placed on a rough horizontal plane A time dependent horizontal force F =kt acts on the block (k =2N//s) . Find the frictional force between the block and the plane at t =2 seconds and t =5 seconds (mu =0.2) .

A block of mass m slides down an inclined plane of inclination theta with uniform speed The coefficient of friction between the block and the plane is mu . The contact force between the block and the plane is .

A block of mass m slides down an inclined plane of inclination theta with uniform speed. The coefficient of friction between the block and the plane is mu . The contact force between the block and the plane is

A small block of mass 20kg rests on a bigger block of mass 30kg , which lies on a smooth horizontal plane. Initially the whole system is at rest. The coefficient of friction between the blocks is 0.5 . The horizontal force F=50N is applied on the lower block. a. Find the work done by fricitonal force on upper block and on the lower block in t=2s . b. Is the magnitude of work done by the frictional force on upper and lower blocks same? c. Is the work done by the frictional force on the upper block converted to heat or mechanical energy or both?

Block B lying on a table weighs w. The coefficient of static friction between the block and the table is mu. Assume that the cord between B and the knot is horizontal. The maximum weight of the block A for which the system will be stationary is

A block of mass m is kept on a rough plank which moves with a horizontal acceleration a. If the plank was at rest at t=0 , and the block does not slide relative to the plank, find the work done by friction on the (a) block, (b) plane, (c) system, (block+plank) during time t .

A small block is kept on a platform executing SHM in the horizontal plane, described by x=A sin omegat . The time period of SHM is T and the coefficient of friction between the block and the platform is mu . The condition that the block does not slip on the platform at any instant is mu ge (x pi^(2)A)/(gT^(2)) then write the value of 'x'