WORK DONE BY CONSTANT FORCE
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Work, Energy and Power

268824 A plate of mass \(m\), breadth ' \(a\) ' and length 'b'is initially lying on a horizontal floor with length parallel to the floor and breadth perpendicular to the floor. The work done to erect it on its breadth is

1 \(m g \frac{b}{2}\)
2 \(m g\) B \(^{a}+\frac{b}{2} \theta\)
3 \(m g \frac{b-a}{2} \theta\)
4 \(m g \square \frac{b+a}{2} \theta\)
Work, Energy and Power

268825 A block of mass\(10 \mathrm{~kg}\) slides down a rough slope which is inclined at \(45^{\circ}\) to the horizontal. The coefficient of sliding friction is \(\mathbf{0 . 3 0}\). When the block has to slide \(5 \mathrm{~m}\), the work done on the block by the force of friction is nearly

1 \(115 \mathrm{~J}\)
2 \(-75 \sqrt{2} J\)
3 \(321.4 \mathrm{~J}\)
4 \(-321.4 \mathrm{~J}\)
Work, Energy and Power

268826 A uniform rope of length '\(L\) and linear density ' \(\mu\) ' is on a smooth horizontal table with a length ' \(l\) ' lying on the table. The work done in pulling the hanging part on to the table is

1 \(\frac{\mu g(L-l)^{2}}{2}\)
2 \(\frac{\mu g(L-l)^{2}}{2 l^{2}}\)
3 \(\frac{\mu g(L-l)^{2}}{2 L^{2}}\)
4 \(\frac{\mu g L}{2(L-l)}\)
Work, Energy and Power

268827 A uniform rod of mass\(2 \mathrm{~kg}\) and length \(l\) is lying on a horizontal surface. If the work done in raising one end of the rod through an angle \(45^{0}\) is ' \(W\) ', then the work done in raising it further \(45^{\circ}\) is

1 \(\mathrm{W}\)
2 \(\sqrt{2} W\)
3 \(\frac{W}{\sqrt{2}}\)
4 \((\sqrt{2}-1) W\)
Work, Energy and Power

268872 A long rod \(A B C\) of mass " \(m\) " and length " \(L\) " has two particles of masses " \(m\) " and " \(2 m\) " attached to it as shown in the figure. The system is initially in the horizontal position. The work to be done to keep it vertical with \(A\) hinged at the bottom is

1 \(2 \mathrm{mgL}\)
2 \(3 \mathrm{mgL} / 2\)
3 \(5 \mathrm{mgL} / 2\)
4 \(3 \mathrm{mgL}\)
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Work, Energy and Power

268824 A plate of mass \(m\), breadth ' \(a\) ' and length 'b'is initially lying on a horizontal floor with length parallel to the floor and breadth perpendicular to the floor. The work done to erect it on its breadth is

1 \(m g \frac{b}{2}\)
2 \(m g\) B \(^{a}+\frac{b}{2} \theta\)
3 \(m g \frac{b-a}{2} \theta\)
4 \(m g \square \frac{b+a}{2} \theta\)
Work, Energy and Power

268825 A block of mass\(10 \mathrm{~kg}\) slides down a rough slope which is inclined at \(45^{\circ}\) to the horizontal. The coefficient of sliding friction is \(\mathbf{0 . 3 0}\). When the block has to slide \(5 \mathrm{~m}\), the work done on the block by the force of friction is nearly

1 \(115 \mathrm{~J}\)
2 \(-75 \sqrt{2} J\)
3 \(321.4 \mathrm{~J}\)
4 \(-321.4 \mathrm{~J}\)
Work, Energy and Power

268826 A uniform rope of length '\(L\) and linear density ' \(\mu\) ' is on a smooth horizontal table with a length ' \(l\) ' lying on the table. The work done in pulling the hanging part on to the table is

1 \(\frac{\mu g(L-l)^{2}}{2}\)
2 \(\frac{\mu g(L-l)^{2}}{2 l^{2}}\)
3 \(\frac{\mu g(L-l)^{2}}{2 L^{2}}\)
4 \(\frac{\mu g L}{2(L-l)}\)
Work, Energy and Power

268827 A uniform rod of mass\(2 \mathrm{~kg}\) and length \(l\) is lying on a horizontal surface. If the work done in raising one end of the rod through an angle \(45^{0}\) is ' \(W\) ', then the work done in raising it further \(45^{\circ}\) is

1 \(\mathrm{W}\)
2 \(\sqrt{2} W\)
3 \(\frac{W}{\sqrt{2}}\)
4 \((\sqrt{2}-1) W\)
Work, Energy and Power

268872 A long rod \(A B C\) of mass " \(m\) " and length " \(L\) " has two particles of masses " \(m\) " and " \(2 m\) " attached to it as shown in the figure. The system is initially in the horizontal position. The work to be done to keep it vertical with \(A\) hinged at the bottom is

1 \(2 \mathrm{mgL}\)
2 \(3 \mathrm{mgL} / 2\)
3 \(5 \mathrm{mgL} / 2\)
4 \(3 \mathrm{mgL}\)
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Work, Energy and Power

268824 A plate of mass \(m\), breadth ' \(a\) ' and length 'b'is initially lying on a horizontal floor with length parallel to the floor and breadth perpendicular to the floor. The work done to erect it on its breadth is

1 \(m g \frac{b}{2}\)
2 \(m g\) B \(^{a}+\frac{b}{2} \theta\)
3 \(m g \frac{b-a}{2} \theta\)
4 \(m g \square \frac{b+a}{2} \theta\)
Work, Energy and Power

268825 A block of mass\(10 \mathrm{~kg}\) slides down a rough slope which is inclined at \(45^{\circ}\) to the horizontal. The coefficient of sliding friction is \(\mathbf{0 . 3 0}\). When the block has to slide \(5 \mathrm{~m}\), the work done on the block by the force of friction is nearly

1 \(115 \mathrm{~J}\)
2 \(-75 \sqrt{2} J\)
3 \(321.4 \mathrm{~J}\)
4 \(-321.4 \mathrm{~J}\)
Work, Energy and Power

268826 A uniform rope of length '\(L\) and linear density ' \(\mu\) ' is on a smooth horizontal table with a length ' \(l\) ' lying on the table. The work done in pulling the hanging part on to the table is

1 \(\frac{\mu g(L-l)^{2}}{2}\)
2 \(\frac{\mu g(L-l)^{2}}{2 l^{2}}\)
3 \(\frac{\mu g(L-l)^{2}}{2 L^{2}}\)
4 \(\frac{\mu g L}{2(L-l)}\)
Work, Energy and Power

268827 A uniform rod of mass\(2 \mathrm{~kg}\) and length \(l\) is lying on a horizontal surface. If the work done in raising one end of the rod through an angle \(45^{0}\) is ' \(W\) ', then the work done in raising it further \(45^{\circ}\) is

1 \(\mathrm{W}\)
2 \(\sqrt{2} W\)
3 \(\frac{W}{\sqrt{2}}\)
4 \((\sqrt{2}-1) W\)
Work, Energy and Power

268872 A long rod \(A B C\) of mass " \(m\) " and length " \(L\) " has two particles of masses " \(m\) " and " \(2 m\) " attached to it as shown in the figure. The system is initially in the horizontal position. The work to be done to keep it vertical with \(A\) hinged at the bottom is

1 \(2 \mathrm{mgL}\)
2 \(3 \mathrm{mgL} / 2\)
3 \(5 \mathrm{mgL} / 2\)
4 \(3 \mathrm{mgL}\)
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Work, Energy and Power

268824 A plate of mass \(m\), breadth ' \(a\) ' and length 'b'is initially lying on a horizontal floor with length parallel to the floor and breadth perpendicular to the floor. The work done to erect it on its breadth is

1 \(m g \frac{b}{2}\)
2 \(m g\) B \(^{a}+\frac{b}{2} \theta\)
3 \(m g \frac{b-a}{2} \theta\)
4 \(m g \square \frac{b+a}{2} \theta\)
Work, Energy and Power

268825 A block of mass\(10 \mathrm{~kg}\) slides down a rough slope which is inclined at \(45^{\circ}\) to the horizontal. The coefficient of sliding friction is \(\mathbf{0 . 3 0}\). When the block has to slide \(5 \mathrm{~m}\), the work done on the block by the force of friction is nearly

1 \(115 \mathrm{~J}\)
2 \(-75 \sqrt{2} J\)
3 \(321.4 \mathrm{~J}\)
4 \(-321.4 \mathrm{~J}\)
Work, Energy and Power

268826 A uniform rope of length '\(L\) and linear density ' \(\mu\) ' is on a smooth horizontal table with a length ' \(l\) ' lying on the table. The work done in pulling the hanging part on to the table is

1 \(\frac{\mu g(L-l)^{2}}{2}\)
2 \(\frac{\mu g(L-l)^{2}}{2 l^{2}}\)
3 \(\frac{\mu g(L-l)^{2}}{2 L^{2}}\)
4 \(\frac{\mu g L}{2(L-l)}\)
Work, Energy and Power

268827 A uniform rod of mass\(2 \mathrm{~kg}\) and length \(l\) is lying on a horizontal surface. If the work done in raising one end of the rod through an angle \(45^{0}\) is ' \(W\) ', then the work done in raising it further \(45^{\circ}\) is

1 \(\mathrm{W}\)
2 \(\sqrt{2} W\)
3 \(\frac{W}{\sqrt{2}}\)
4 \((\sqrt{2}-1) W\)
Work, Energy and Power

268872 A long rod \(A B C\) of mass " \(m\) " and length " \(L\) " has two particles of masses " \(m\) " and " \(2 m\) " attached to it as shown in the figure. The system is initially in the horizontal position. The work to be done to keep it vertical with \(A\) hinged at the bottom is

1 \(2 \mathrm{mgL}\)
2 \(3 \mathrm{mgL} / 2\)
3 \(5 \mathrm{mgL} / 2\)
4 \(3 \mathrm{mgL}\)
NEET DIGITAL LIBRARY
Work, Energy and Power

268824 A plate of mass \(m\), breadth ' \(a\) ' and length 'b'is initially lying on a horizontal floor with length parallel to the floor and breadth perpendicular to the floor. The work done to erect it on its breadth is

1 \(m g \frac{b}{2}\)
2 \(m g\) B \(^{a}+\frac{b}{2} \theta\)
3 \(m g \frac{b-a}{2} \theta\)
4 \(m g \square \frac{b+a}{2} \theta\)
Work, Energy and Power

268825 A block of mass\(10 \mathrm{~kg}\) slides down a rough slope which is inclined at \(45^{\circ}\) to the horizontal. The coefficient of sliding friction is \(\mathbf{0 . 3 0}\). When the block has to slide \(5 \mathrm{~m}\), the work done on the block by the force of friction is nearly

1 \(115 \mathrm{~J}\)
2 \(-75 \sqrt{2} J\)
3 \(321.4 \mathrm{~J}\)
4 \(-321.4 \mathrm{~J}\)
Work, Energy and Power

268826 A uniform rope of length '\(L\) and linear density ' \(\mu\) ' is on a smooth horizontal table with a length ' \(l\) ' lying on the table. The work done in pulling the hanging part on to the table is

1 \(\frac{\mu g(L-l)^{2}}{2}\)
2 \(\frac{\mu g(L-l)^{2}}{2 l^{2}}\)
3 \(\frac{\mu g(L-l)^{2}}{2 L^{2}}\)
4 \(\frac{\mu g L}{2(L-l)}\)
Work, Energy and Power

268827 A uniform rod of mass\(2 \mathrm{~kg}\) and length \(l\) is lying on a horizontal surface. If the work done in raising one end of the rod through an angle \(45^{0}\) is ' \(W\) ', then the work done in raising it further \(45^{\circ}\) is

1 \(\mathrm{W}\)
2 \(\sqrt{2} W\)
3 \(\frac{W}{\sqrt{2}}\)
4 \((\sqrt{2}-1) W\)
Work, Energy and Power

268872 A long rod \(A B C\) of mass " \(m\) " and length " \(L\) " has two particles of masses " \(m\) " and " \(2 m\) " attached to it as shown in the figure. The system is initially in the horizontal position. The work to be done to keep it vertical with \(A\) hinged at the bottom is

1 \(2 \mathrm{mgL}\)
2 \(3 \mathrm{mgL} / 2\)
3 \(5 \mathrm{mgL} / 2\)
4 \(3 \mathrm{mgL}\)