00. Centre of Mass
Rotational Motion

149738 Two objects of masses \(200 \mathrm{~g}\) and \(500 \mathrm{~g}\) possess velocities \(10 \hat{\mathbf{i}} \mathrm{ms}^{-1}\) and \((3 \hat{\mathbf{i}}+5 \hat{\mathbf{j}}) \mathrm{ms}^{-1}\)
respectively. The velocity of their centre of mass in \(\mathbf{~ s s}^{-1}\) is

1 \(5 \hat{\mathrm{i}}-25 \hat{\mathrm{j}}\)
2 \(\frac{5}{7} \hat{\mathrm{i}}-25 \hat{\mathrm{j}}\)
3 \(5 \hat{\mathrm{i}}+\frac{25}{7} \hat{\mathrm{j}}\)
4 \(25 \hat{\mathrm{i}}-\frac{5}{7} \hat{\mathrm{j}}\)
Rotational Motion

149739 Two particles of equal mass have velocities \(\overrightarrow{\mathbf{v}}_{1}=4 \hat{\mathbf{i}} \mathrm{ms}^{-1}\) and \(\overrightarrow{\mathbf{v}}_{2}=4 \hat{\mathbf{j}} \mathrm{ms}^{-1}\). First particle has an acceleration \(\overrightarrow{\mathbf{a}}_{1}=(\mathbf{5} \hat{\mathbf{i}}+\mathbf{5} \hat{\mathbf{j}})\) while the acceleration of the other particle is zero. The centre of mass of the two particles moves in a path of

1 straight line
2 parabola
3 circle
4 ellipse
Rotational Motion

149740 The centre of mass of three particles of masses \(1 \mathrm{~kg}, 2 \mathrm{~kg}\) and \(3 \mathrm{~kg}\) is located at \((2,2,2)\). The position of the fourth mass of \(4 \mathrm{~kg}\) to be placed in the system as that the new centre of mass is at \((0,0,0)\) is

1 \((-3,-3,-3)\)
2 \((-3,3,-3)\)
3 \((2,3,-3)\)
4 \((2,-2,3)\)
Rotational Motion

149741 Two bodies of \(6 \mathrm{~kg}\) and \(4 \mathrm{~kg}\) masses have their velocity \((5 \hat{i}-2 \hat{j}+10 \hat{k})\) and \((10 \hat{i}-2 \hat{j}+5 \hat{k})\) respectively. Then, the velocity of their centre of mass is

1 \(5 \hat{i}+2 \hat{j}-8 \hat{k}\)
2 \(7 \hat{i}+2 \hat{j}-8 \hat{k}\)
3 \(7 \hat{i}-2 \hat{j}+8 \hat{k}\)
4 \(5 \hat{\mathrm{i}}-2 \hat{\mathrm{j}}+8 \hat{\mathrm{k}}\)
Rotational Motion

149742 A system of two particles is having masses \(m_{1}\) and \(m_{2}\). If the particle of mass \(m_{1}\) is pushed towards the center of mass of particles through a distance \(d\), by what distance the particle of mass \(m_{2}\) should be moved so as to keep the centre of mass of particles at the original position?

1 \(\frac{m_{1}}{m_{1}+m_{2}} d\)
2 \(d\)
3 \(\frac{m_{1}}{m_{2}} d\)
4 \(\frac{\mathrm{m}_{2}}{\mathrm{~m}_{1}} \mathrm{~d}\)
Rotational Motion

149738 Two objects of masses \(200 \mathrm{~g}\) and \(500 \mathrm{~g}\) possess velocities \(10 \hat{\mathbf{i}} \mathrm{ms}^{-1}\) and \((3 \hat{\mathbf{i}}+5 \hat{\mathbf{j}}) \mathrm{ms}^{-1}\)
respectively. The velocity of their centre of mass in \(\mathbf{~ s s}^{-1}\) is

1 \(5 \hat{\mathrm{i}}-25 \hat{\mathrm{j}}\)
2 \(\frac{5}{7} \hat{\mathrm{i}}-25 \hat{\mathrm{j}}\)
3 \(5 \hat{\mathrm{i}}+\frac{25}{7} \hat{\mathrm{j}}\)
4 \(25 \hat{\mathrm{i}}-\frac{5}{7} \hat{\mathrm{j}}\)
Rotational Motion

149739 Two particles of equal mass have velocities \(\overrightarrow{\mathbf{v}}_{1}=4 \hat{\mathbf{i}} \mathrm{ms}^{-1}\) and \(\overrightarrow{\mathbf{v}}_{2}=4 \hat{\mathbf{j}} \mathrm{ms}^{-1}\). First particle has an acceleration \(\overrightarrow{\mathbf{a}}_{1}=(\mathbf{5} \hat{\mathbf{i}}+\mathbf{5} \hat{\mathbf{j}})\) while the acceleration of the other particle is zero. The centre of mass of the two particles moves in a path of

1 straight line
2 parabola
3 circle
4 ellipse
Rotational Motion

149740 The centre of mass of three particles of masses \(1 \mathrm{~kg}, 2 \mathrm{~kg}\) and \(3 \mathrm{~kg}\) is located at \((2,2,2)\). The position of the fourth mass of \(4 \mathrm{~kg}\) to be placed in the system as that the new centre of mass is at \((0,0,0)\) is

1 \((-3,-3,-3)\)
2 \((-3,3,-3)\)
3 \((2,3,-3)\)
4 \((2,-2,3)\)
Rotational Motion

149741 Two bodies of \(6 \mathrm{~kg}\) and \(4 \mathrm{~kg}\) masses have their velocity \((5 \hat{i}-2 \hat{j}+10 \hat{k})\) and \((10 \hat{i}-2 \hat{j}+5 \hat{k})\) respectively. Then, the velocity of their centre of mass is

1 \(5 \hat{i}+2 \hat{j}-8 \hat{k}\)
2 \(7 \hat{i}+2 \hat{j}-8 \hat{k}\)
3 \(7 \hat{i}-2 \hat{j}+8 \hat{k}\)
4 \(5 \hat{\mathrm{i}}-2 \hat{\mathrm{j}}+8 \hat{\mathrm{k}}\)
Rotational Motion

149742 A system of two particles is having masses \(m_{1}\) and \(m_{2}\). If the particle of mass \(m_{1}\) is pushed towards the center of mass of particles through a distance \(d\), by what distance the particle of mass \(m_{2}\) should be moved so as to keep the centre of mass of particles at the original position?

1 \(\frac{m_{1}}{m_{1}+m_{2}} d\)
2 \(d\)
3 \(\frac{m_{1}}{m_{2}} d\)
4 \(\frac{\mathrm{m}_{2}}{\mathrm{~m}_{1}} \mathrm{~d}\)
Rotational Motion

149738 Two objects of masses \(200 \mathrm{~g}\) and \(500 \mathrm{~g}\) possess velocities \(10 \hat{\mathbf{i}} \mathrm{ms}^{-1}\) and \((3 \hat{\mathbf{i}}+5 \hat{\mathbf{j}}) \mathrm{ms}^{-1}\)
respectively. The velocity of their centre of mass in \(\mathbf{~ s s}^{-1}\) is

1 \(5 \hat{\mathrm{i}}-25 \hat{\mathrm{j}}\)
2 \(\frac{5}{7} \hat{\mathrm{i}}-25 \hat{\mathrm{j}}\)
3 \(5 \hat{\mathrm{i}}+\frac{25}{7} \hat{\mathrm{j}}\)
4 \(25 \hat{\mathrm{i}}-\frac{5}{7} \hat{\mathrm{j}}\)
Rotational Motion

149739 Two particles of equal mass have velocities \(\overrightarrow{\mathbf{v}}_{1}=4 \hat{\mathbf{i}} \mathrm{ms}^{-1}\) and \(\overrightarrow{\mathbf{v}}_{2}=4 \hat{\mathbf{j}} \mathrm{ms}^{-1}\). First particle has an acceleration \(\overrightarrow{\mathbf{a}}_{1}=(\mathbf{5} \hat{\mathbf{i}}+\mathbf{5} \hat{\mathbf{j}})\) while the acceleration of the other particle is zero. The centre of mass of the two particles moves in a path of

1 straight line
2 parabola
3 circle
4 ellipse
Rotational Motion

149740 The centre of mass of three particles of masses \(1 \mathrm{~kg}, 2 \mathrm{~kg}\) and \(3 \mathrm{~kg}\) is located at \((2,2,2)\). The position of the fourth mass of \(4 \mathrm{~kg}\) to be placed in the system as that the new centre of mass is at \((0,0,0)\) is

1 \((-3,-3,-3)\)
2 \((-3,3,-3)\)
3 \((2,3,-3)\)
4 \((2,-2,3)\)
Rotational Motion

149741 Two bodies of \(6 \mathrm{~kg}\) and \(4 \mathrm{~kg}\) masses have their velocity \((5 \hat{i}-2 \hat{j}+10 \hat{k})\) and \((10 \hat{i}-2 \hat{j}+5 \hat{k})\) respectively. Then, the velocity of their centre of mass is

1 \(5 \hat{i}+2 \hat{j}-8 \hat{k}\)
2 \(7 \hat{i}+2 \hat{j}-8 \hat{k}\)
3 \(7 \hat{i}-2 \hat{j}+8 \hat{k}\)
4 \(5 \hat{\mathrm{i}}-2 \hat{\mathrm{j}}+8 \hat{\mathrm{k}}\)
Rotational Motion

149742 A system of two particles is having masses \(m_{1}\) and \(m_{2}\). If the particle of mass \(m_{1}\) is pushed towards the center of mass of particles through a distance \(d\), by what distance the particle of mass \(m_{2}\) should be moved so as to keep the centre of mass of particles at the original position?

1 \(\frac{m_{1}}{m_{1}+m_{2}} d\)
2 \(d\)
3 \(\frac{m_{1}}{m_{2}} d\)
4 \(\frac{\mathrm{m}_{2}}{\mathrm{~m}_{1}} \mathrm{~d}\)
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Rotational Motion

149738 Two objects of masses \(200 \mathrm{~g}\) and \(500 \mathrm{~g}\) possess velocities \(10 \hat{\mathbf{i}} \mathrm{ms}^{-1}\) and \((3 \hat{\mathbf{i}}+5 \hat{\mathbf{j}}) \mathrm{ms}^{-1}\)
respectively. The velocity of their centre of mass in \(\mathbf{~ s s}^{-1}\) is

1 \(5 \hat{\mathrm{i}}-25 \hat{\mathrm{j}}\)
2 \(\frac{5}{7} \hat{\mathrm{i}}-25 \hat{\mathrm{j}}\)
3 \(5 \hat{\mathrm{i}}+\frac{25}{7} \hat{\mathrm{j}}\)
4 \(25 \hat{\mathrm{i}}-\frac{5}{7} \hat{\mathrm{j}}\)
Rotational Motion

149739 Two particles of equal mass have velocities \(\overrightarrow{\mathbf{v}}_{1}=4 \hat{\mathbf{i}} \mathrm{ms}^{-1}\) and \(\overrightarrow{\mathbf{v}}_{2}=4 \hat{\mathbf{j}} \mathrm{ms}^{-1}\). First particle has an acceleration \(\overrightarrow{\mathbf{a}}_{1}=(\mathbf{5} \hat{\mathbf{i}}+\mathbf{5} \hat{\mathbf{j}})\) while the acceleration of the other particle is zero. The centre of mass of the two particles moves in a path of

1 straight line
2 parabola
3 circle
4 ellipse
Rotational Motion

149740 The centre of mass of three particles of masses \(1 \mathrm{~kg}, 2 \mathrm{~kg}\) and \(3 \mathrm{~kg}\) is located at \((2,2,2)\). The position of the fourth mass of \(4 \mathrm{~kg}\) to be placed in the system as that the new centre of mass is at \((0,0,0)\) is

1 \((-3,-3,-3)\)
2 \((-3,3,-3)\)
3 \((2,3,-3)\)
4 \((2,-2,3)\)
Rotational Motion

149741 Two bodies of \(6 \mathrm{~kg}\) and \(4 \mathrm{~kg}\) masses have their velocity \((5 \hat{i}-2 \hat{j}+10 \hat{k})\) and \((10 \hat{i}-2 \hat{j}+5 \hat{k})\) respectively. Then, the velocity of their centre of mass is

1 \(5 \hat{i}+2 \hat{j}-8 \hat{k}\)
2 \(7 \hat{i}+2 \hat{j}-8 \hat{k}\)
3 \(7 \hat{i}-2 \hat{j}+8 \hat{k}\)
4 \(5 \hat{\mathrm{i}}-2 \hat{\mathrm{j}}+8 \hat{\mathrm{k}}\)
Rotational Motion

149742 A system of two particles is having masses \(m_{1}\) and \(m_{2}\). If the particle of mass \(m_{1}\) is pushed towards the center of mass of particles through a distance \(d\), by what distance the particle of mass \(m_{2}\) should be moved so as to keep the centre of mass of particles at the original position?

1 \(\frac{m_{1}}{m_{1}+m_{2}} d\)
2 \(d\)
3 \(\frac{m_{1}}{m_{2}} d\)
4 \(\frac{\mathrm{m}_{2}}{\mathrm{~m}_{1}} \mathrm{~d}\)
Rotational Motion

149738 Two objects of masses \(200 \mathrm{~g}\) and \(500 \mathrm{~g}\) possess velocities \(10 \hat{\mathbf{i}} \mathrm{ms}^{-1}\) and \((3 \hat{\mathbf{i}}+5 \hat{\mathbf{j}}) \mathrm{ms}^{-1}\)
respectively. The velocity of their centre of mass in \(\mathbf{~ s s}^{-1}\) is

1 \(5 \hat{\mathrm{i}}-25 \hat{\mathrm{j}}\)
2 \(\frac{5}{7} \hat{\mathrm{i}}-25 \hat{\mathrm{j}}\)
3 \(5 \hat{\mathrm{i}}+\frac{25}{7} \hat{\mathrm{j}}\)
4 \(25 \hat{\mathrm{i}}-\frac{5}{7} \hat{\mathrm{j}}\)
Rotational Motion

149739 Two particles of equal mass have velocities \(\overrightarrow{\mathbf{v}}_{1}=4 \hat{\mathbf{i}} \mathrm{ms}^{-1}\) and \(\overrightarrow{\mathbf{v}}_{2}=4 \hat{\mathbf{j}} \mathrm{ms}^{-1}\). First particle has an acceleration \(\overrightarrow{\mathbf{a}}_{1}=(\mathbf{5} \hat{\mathbf{i}}+\mathbf{5} \hat{\mathbf{j}})\) while the acceleration of the other particle is zero. The centre of mass of the two particles moves in a path of

1 straight line
2 parabola
3 circle
4 ellipse
Rotational Motion

149740 The centre of mass of three particles of masses \(1 \mathrm{~kg}, 2 \mathrm{~kg}\) and \(3 \mathrm{~kg}\) is located at \((2,2,2)\). The position of the fourth mass of \(4 \mathrm{~kg}\) to be placed in the system as that the new centre of mass is at \((0,0,0)\) is

1 \((-3,-3,-3)\)
2 \((-3,3,-3)\)
3 \((2,3,-3)\)
4 \((2,-2,3)\)
Rotational Motion

149741 Two bodies of \(6 \mathrm{~kg}\) and \(4 \mathrm{~kg}\) masses have their velocity \((5 \hat{i}-2 \hat{j}+10 \hat{k})\) and \((10 \hat{i}-2 \hat{j}+5 \hat{k})\) respectively. Then, the velocity of their centre of mass is

1 \(5 \hat{i}+2 \hat{j}-8 \hat{k}\)
2 \(7 \hat{i}+2 \hat{j}-8 \hat{k}\)
3 \(7 \hat{i}-2 \hat{j}+8 \hat{k}\)
4 \(5 \hat{\mathrm{i}}-2 \hat{\mathrm{j}}+8 \hat{\mathrm{k}}\)
Rotational Motion

149742 A system of two particles is having masses \(m_{1}\) and \(m_{2}\). If the particle of mass \(m_{1}\) is pushed towards the center of mass of particles through a distance \(d\), by what distance the particle of mass \(m_{2}\) should be moved so as to keep the centre of mass of particles at the original position?

1 \(\frac{m_{1}}{m_{1}+m_{2}} d\)
2 \(d\)
3 \(\frac{m_{1}}{m_{2}} d\)
4 \(\frac{\mathrm{m}_{2}}{\mathrm{~m}_{1}} \mathrm{~d}\)