372128 A uniform chain of length \(L\) hangs partially from table and held in equilibrium by friction. If greatest length of chain that hangs without slipping is \(l\) then the coefficient of friction between chain and table is

372129 A body of weight \(50 \mathrm{~N}\) is placed on a smooth surface. If the force required to move the body on the rough surface is \(30 \mathrm{~N}\) the coefficient of friction is

372130 A body of mass \(10 \mathrm{~kg}\) lies on a rough horizontal surface. When a horizontal force \(F\) Newton acts on it, it gets an acceleration of \(5 \mathrm{~ms}^{-2}\) and when the horizontal force is doubled, it gets an acceleration of \(18 \mathrm{~ms}^{-2}\). Then, the coefficient of friction between the body and the horizontal surface is (assume \(g=10 \mathbf{m s}^{-2}\) )

372131 An iron block of sides \(50 \mathrm{~cm} \times 8 \mathrm{~cm} \times 15 \mathrm{~cm}\) has to be pushed along the floor. The force required will be minimum when the surface in contact with ground is

372132 To determine the coefficient of friction between a rough surface and a block, the surface is kept inclined at \(45^{\circ}\) and the block is released from rest. The block takes a time \(t\) in moving a distance \(d\). The rough surface is then replaced by a smooth surface and the same experiment is repeated. The block now takes a time \(t / 2\) in moving down the same distance \(d\). The coefficient of friction is

372128 A uniform chain of length \(L\) hangs partially from table and held in equilibrium by friction. If greatest length of chain that hangs without slipping is \(l\) then the coefficient of friction between chain and table is

372129 A body of weight \(50 \mathrm{~N}\) is placed on a smooth surface. If the force required to move the body on the rough surface is \(30 \mathrm{~N}\) the coefficient of friction is

372130 A body of mass \(10 \mathrm{~kg}\) lies on a rough horizontal surface. When a horizontal force \(F\) Newton acts on it, it gets an acceleration of \(5 \mathrm{~ms}^{-2}\) and when the horizontal force is doubled, it gets an acceleration of \(18 \mathrm{~ms}^{-2}\). Then, the coefficient of friction between the body and the horizontal surface is (assume \(g=10 \mathbf{m s}^{-2}\) )

372131 An iron block of sides \(50 \mathrm{~cm} \times 8 \mathrm{~cm} \times 15 \mathrm{~cm}\) has to be pushed along the floor. The force required will be minimum when the surface in contact with ground is

372132 To determine the coefficient of friction between a rough surface and a block, the surface is kept inclined at \(45^{\circ}\) and the block is released from rest. The block takes a time \(t\) in moving a distance \(d\). The rough surface is then replaced by a smooth surface and the same experiment is repeated. The block now takes a time \(t / 2\) in moving down the same distance \(d\). The coefficient of friction is

372128 A uniform chain of length \(L\) hangs partially from table and held in equilibrium by friction. If greatest length of chain that hangs without slipping is \(l\) then the coefficient of friction between chain and table is

372129 A body of weight \(50 \mathrm{~N}\) is placed on a smooth surface. If the force required to move the body on the rough surface is \(30 \mathrm{~N}\) the coefficient of friction is

372130 A body of mass \(10 \mathrm{~kg}\) lies on a rough horizontal surface. When a horizontal force \(F\) Newton acts on it, it gets an acceleration of \(5 \mathrm{~ms}^{-2}\) and when the horizontal force is doubled, it gets an acceleration of \(18 \mathrm{~ms}^{-2}\). Then, the coefficient of friction between the body and the horizontal surface is (assume \(g=10 \mathbf{m s}^{-2}\) )

372131 An iron block of sides \(50 \mathrm{~cm} \times 8 \mathrm{~cm} \times 15 \mathrm{~cm}\) has to be pushed along the floor. The force required will be minimum when the surface in contact with ground is

372132 To determine the coefficient of friction between a rough surface and a block, the surface is kept inclined at \(45^{\circ}\) and the block is released from rest. The block takes a time \(t\) in moving a distance \(d\). The rough surface is then replaced by a smooth surface and the same experiment is repeated. The block now takes a time \(t / 2\) in moving down the same distance \(d\). The coefficient of friction is

372128 A uniform chain of length \(L\) hangs partially from table and held in equilibrium by friction. If greatest length of chain that hangs without slipping is \(l\) then the coefficient of friction between chain and table is

372129 A body of weight \(50 \mathrm{~N}\) is placed on a smooth surface. If the force required to move the body on the rough surface is \(30 \mathrm{~N}\) the coefficient of friction is

372130 A body of mass \(10 \mathrm{~kg}\) lies on a rough horizontal surface. When a horizontal force \(F\) Newton acts on it, it gets an acceleration of \(5 \mathrm{~ms}^{-2}\) and when the horizontal force is doubled, it gets an acceleration of \(18 \mathrm{~ms}^{-2}\). Then, the coefficient of friction between the body and the horizontal surface is (assume \(g=10 \mathbf{m s}^{-2}\) )

372131 An iron block of sides \(50 \mathrm{~cm} \times 8 \mathrm{~cm} \times 15 \mathrm{~cm}\) has to be pushed along the floor. The force required will be minimum when the surface in contact with ground is

372132 To determine the coefficient of friction between a rough surface and a block, the surface is kept inclined at \(45^{\circ}\) and the block is released from rest. The block takes a time \(t\) in moving a distance \(d\). The rough surface is then replaced by a smooth surface and the same experiment is repeated. The block now takes a time \(t / 2\) in moving down the same distance \(d\). The coefficient of friction is

372128 A uniform chain of length \(L\) hangs partially from table and held in equilibrium by friction. If greatest length of chain that hangs without slipping is \(l\) then the coefficient of friction between chain and table is

372129 A body of weight \(50 \mathrm{~N}\) is placed on a smooth surface. If the force required to move the body on the rough surface is \(30 \mathrm{~N}\) the coefficient of friction is

372130 A body of mass \(10 \mathrm{~kg}\) lies on a rough horizontal surface. When a horizontal force \(F\) Newton acts on it, it gets an acceleration of \(5 \mathrm{~ms}^{-2}\) and when the horizontal force is doubled, it gets an acceleration of \(18 \mathrm{~ms}^{-2}\). Then, the coefficient of friction between the body and the horizontal surface is (assume \(g=10 \mathbf{m s}^{-2}\) )

372131 An iron block of sides \(50 \mathrm{~cm} \times 8 \mathrm{~cm} \times 15 \mathrm{~cm}\) has to be pushed along the floor. The force required will be minimum when the surface in contact with ground is

372132 To determine the coefficient of friction between a rough surface and a block, the surface is kept inclined at \(45^{\circ}\) and the block is released from rest. The block takes a time \(t\) in moving a distance \(d\). The rough surface is then replaced by a smooth surface and the same experiment is repeated. The block now takes a time \(t / 2\) in moving down the same distance \(d\). The coefficient of friction is