ROTATIONAL INERTIA OF SOLID BODIES, ROTATIONAL DYNAMICS
Rotational Motion

269401 Mass of thin long metal rod is\(2 \mathrm{~kg}\) and its moment of inertia about an axis perpendicular to the length of rod and passing through its one end is \(0.5 \mathrm{~kg} \mathrm{~m}^{2}\). Its radius of gyration is

1 \(20 \mathrm{~cm}\)
2 \(40 \mathrm{~cm}\)
3 \(50 \mathrm{~cm}\)
4 \(1 \mathrm{~m}\)
Rotational Motion

269414 An automobile engine develops\(100 \mathrm{KW}\) when rotating at a speed of \(1800 \mathrm{rev} / \mathrm{min}\). The torque it delivers ( in \(\mathrm{N}-\mathrm{m}\) )

1 350
2 440
3 531
4 628
Rotational Motion

269415 An electric motor exerts a constant torque\(5 \mathrm{Nm}\) on a fly wheel by which it is rotated at the rate of \(420 \mathrm{rpm}\) The power of motor is

1 110watt
2 150watt
3 220watt
4 300watt
Rotational Motion

269445 The ratio of moments of inertia of a solid sphere about axes passing through itscentre and tangent respectively is

1 \(2: 5\)
2 \(2: 7\)
3 \(5: 2\)
4 \(7: 2\)
Rotational Motion

269401 Mass of thin long metal rod is\(2 \mathrm{~kg}\) and its moment of inertia about an axis perpendicular to the length of rod and passing through its one end is \(0.5 \mathrm{~kg} \mathrm{~m}^{2}\). Its radius of gyration is

1 \(20 \mathrm{~cm}\)
2 \(40 \mathrm{~cm}\)
3 \(50 \mathrm{~cm}\)
4 \(1 \mathrm{~m}\)
Rotational Motion

269414 An automobile engine develops\(100 \mathrm{KW}\) when rotating at a speed of \(1800 \mathrm{rev} / \mathrm{min}\). The torque it delivers ( in \(\mathrm{N}-\mathrm{m}\) )

1 350
2 440
3 531
4 628
Rotational Motion

269415 An electric motor exerts a constant torque\(5 \mathrm{Nm}\) on a fly wheel by which it is rotated at the rate of \(420 \mathrm{rpm}\) The power of motor is

1 110watt
2 150watt
3 220watt
4 300watt
Rotational Motion

269445 The ratio of moments of inertia of a solid sphere about axes passing through itscentre and tangent respectively is

1 \(2: 5\)
2 \(2: 7\)
3 \(5: 2\)
4 \(7: 2\)
Rotational Motion

269401 Mass of thin long metal rod is\(2 \mathrm{~kg}\) and its moment of inertia about an axis perpendicular to the length of rod and passing through its one end is \(0.5 \mathrm{~kg} \mathrm{~m}^{2}\). Its radius of gyration is

1 \(20 \mathrm{~cm}\)
2 \(40 \mathrm{~cm}\)
3 \(50 \mathrm{~cm}\)
4 \(1 \mathrm{~m}\)
Rotational Motion

269414 An automobile engine develops\(100 \mathrm{KW}\) when rotating at a speed of \(1800 \mathrm{rev} / \mathrm{min}\). The torque it delivers ( in \(\mathrm{N}-\mathrm{m}\) )

1 350
2 440
3 531
4 628
Rotational Motion

269415 An electric motor exerts a constant torque\(5 \mathrm{Nm}\) on a fly wheel by which it is rotated at the rate of \(420 \mathrm{rpm}\) The power of motor is

1 110watt
2 150watt
3 220watt
4 300watt
Rotational Motion

269445 The ratio of moments of inertia of a solid sphere about axes passing through itscentre and tangent respectively is

1 \(2: 5\)
2 \(2: 7\)
3 \(5: 2\)
4 \(7: 2\)
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Rotational Motion

269401 Mass of thin long metal rod is\(2 \mathrm{~kg}\) and its moment of inertia about an axis perpendicular to the length of rod and passing through its one end is \(0.5 \mathrm{~kg} \mathrm{~m}^{2}\). Its radius of gyration is

1 \(20 \mathrm{~cm}\)
2 \(40 \mathrm{~cm}\)
3 \(50 \mathrm{~cm}\)
4 \(1 \mathrm{~m}\)
Rotational Motion

269414 An automobile engine develops\(100 \mathrm{KW}\) when rotating at a speed of \(1800 \mathrm{rev} / \mathrm{min}\). The torque it delivers ( in \(\mathrm{N}-\mathrm{m}\) )

1 350
2 440
3 531
4 628
Rotational Motion

269415 An electric motor exerts a constant torque\(5 \mathrm{Nm}\) on a fly wheel by which it is rotated at the rate of \(420 \mathrm{rpm}\) The power of motor is

1 110watt
2 150watt
3 220watt
4 300watt
Rotational Motion

269445 The ratio of moments of inertia of a solid sphere about axes passing through itscentre and tangent respectively is

1 \(2: 5\)
2 \(2: 7\)
3 \(5: 2\)
4 \(7: 2\)