Physics-
General
Easy
Question
Determine the force ' P ' required to give the open link chain of total length ' L ', a constant velocity v=dy/dt. The chain has a mass ' 
' per unit length. Neglect the small size and mass of the pulley and any friction in the pulley.
The correct answer is:
Related Questions to study
physics-
A ball of mass 1 kg is attached to an inextensible string. The ball is released from the position shown in fig. Find the impulse imparted by the string to the ball immediately after the string becomes taut.
A ball of mass 1 kg is attached to an inextensible string. The ball is released from the position shown in fig. Find the impulse imparted by the string to the ball immediately after the string becomes taut.
physics-General
physics-
A ball A is falling vertically downwards with velocity 
It strikes elastically with a wedge moving horizontally with velocity 
as shown in figure. What must be the ratio 
so that the ball bounces back in vertically upward direction relative to the wedge.
A ball A is falling vertically downwards with velocity It strikes elastically with a wedge moving horizontally with velocity as shown in figure. What must be the ratio so that the ball bounces back in vertically upward direction relative to the wedge.
physics-General
physics-
'n' smooth spheres have masses 'm', 'm/e', ' 
', 
, etc.... are placed in a row with all their centres on a straight line. Initially all the spheres are at rest. The first sphere of mass 'm' is projected with a velocity 'u' towards the second. The velocity of the last sphere after the 
sphere has made a collision with it is (take 'e' as the coefficient of restitution for all the collision)
'n' smooth spheres have masses 'm', 'm/e', ' ', , etc.... are placed in a row with all their centres on a straight line. Initially all the spheres are at rest. The first sphere of mass 'm' is projected with a velocity 'u' towards the second. The velocity of the last sphere after the sphere has made a collision with it is (take 'e' as the coefficient of restitution for all the collision)
physics-General
physics-
If an ivory ball of mass 2 m moving with a velocity ' 
' strikes head on to a close row of three identical ivory balls each of mass m as shown in the figure. Then after the collisions which may be assumed as elastic, which of the following would occur?
If an ivory ball of mass 2 m moving with a velocity ' ' strikes head on to a close row of three identical ivory balls each of mass m as shown in the figure. Then after the collisions which may be assumed as elastic, which of the following would occur?
physics-General
physics-
Three balls A, B and C are placed on a smooth horizontal surface. Given that 
Ball B collides with ball A with an initial velocity V as shown in figure. Find the total number of collisions between the balls. All collisions are elastic.
Three balls A, B and C are placed on a smooth horizontal surface. Given that Ball B collides with ball A with an initial velocity V as shown in figure. Find the total number of collisions between the balls. All collisions are elastic.
physics-General
physics-
Net force acting on block of mass m if the block is stationary with respectively lift is
Net force acting on block of mass m if the block is stationary with respectively lift is
physics-General
physics-
Block A is placed on a rough wedge B which is placed on a smooth surface. The wedge has angle of inclination of 30° and is imparted a horizontal acceleration g towards right. Block A is given an initial velocity 
from rest. Find the coefficient of friction for which block A moves with constant velocity with respect to wedge 
Block A is placed on a rough wedge B which is placed on a smooth surface. The wedge has angle of inclination of 30° and is imparted a horizontal acceleration g towards right. Block A is given an initial velocity from rest. Find the coefficient of friction for which block A moves with constant velocity with respect to wedge
physics-General
physics-
In the diagram shown in figure wedge of mass M is stationary. Block of mass m=2 kg is slipping down. Force of friction on the wedge from ground is :
In the diagram shown in figure wedge of mass M is stationary. Block of mass m=2 kg is slipping down. Force of friction on the wedge from ground is :
physics-General
physics-
In case (i) wedge B is stationary and block A starts sliding when the angle of plane is greater than 
, while in case (ii) wedge B is moving upwards with an acceleration 
and the block A starts sliding when the angle of plane is greater than 
. Coefficient of friction between A and B in both the cases is same. Then :
i) 
ii) 
In case (i) wedge B is stationary and block A starts sliding when the angle of plane is greater than , while in case (ii) wedge B is moving upwards with an acceleration and the block A starts sliding when the angle of plane is greater than . Coefficient of friction between A and B in both the cases is same. Then :
i)
ii)
physics-General
physics-
sphere B is in air sandwiched between blocks A and C which are compressed by two springs of spring constants 
and 
compressed by 
and 
respectively. The coefficient of friction between sphere and blocks is same and other surface are smooth. The ratio 
will be :
sphere B is in air sandwiched between blocks A and C which are compressed by two springs of spring constants and compressed by and respectively. The coefficient of friction between sphere and blocks is same and other surface are smooth. The ratio will be :
physics-General
physics-
A block A of mass 2 kg is resting on the block B of mass 3 kg which is placed on a 30° incline. The coefficient of friction between two blocks is 0.30 and block B and incline is 0.10. A force of 4 N is applied to block A parallel to the incline. Find the acceleration of block A :
A block A of mass 2 kg is resting on the block B of mass 3 kg which is placed on a 30° incline. The coefficient of friction between two blocks is 0.30 and block B and incline is 0.10. A force of 4 N is applied to block A parallel to the incline. Find the acceleration of block A :
physics-General
physics-
A block of mass m is placed on another block of mass M. Two blocks are sliding on a smooth inclined plane. Then, the frictional force developed between the blocks is :
A block of mass m is placed on another block of mass M. Two blocks are sliding on a smooth inclined plane. Then, the frictional force developed between the blocks is :
physics-General
physics-
Three blocks A, B and C of different masses as shown, are placed over each other. The coefficients of friction are shown. Blocks placed in one vertical line are made to move towards right with same velocity at the same instant. Find the time taken by the upper block to slide down the middle block:
Three blocks A, B and C of different masses as shown, are placed over each other. The coefficients of friction are shown. Blocks placed in one vertical line are made to move towards right with same velocity at the same instant. Find the time taken by the upper block to slide down the middle block:
physics-General
physics-
In the arrangement as shown masses of block A and B are 4 m and m respectively. The coefficient of friction between all surfaces is 0.05. What should be ratio of 
so that both blocks A and B move with same acceleration of 
In the arrangement as shown masses of block A and B are 4 m and m respectively. The coefficient of friction between all surfaces is 0.05. What should be ratio of so that both blocks A and B move with same acceleration of
physics-General
physics-
The coefficient of frictions and masses of various blocks are shown. A force 2 N is applied on block B. What will be the acceleration of block B after 4 seconds 
The coefficient of frictions and masses of various blocks are shown. A force 2 N is applied on block B. What will be the acceleration of block B after 4 seconds
physics-General
