149926 A wheel of mass \(20 \mathrm{~kg}\) and radius \(30 \mathrm{~cm}\) is rotating at an angular speed of \(80 \mathrm{rev} / \mathrm{min}\) when the motor is turned off. Neglecting the friction at the axis, calculate the force that must applied tangentially to the wheel to bring it to rest in 5 revolution.

149927 A uniform disc of radius ' \(a\) ' and mass ' \(m\) ' is rotating freely with an angular speed of ' \(\omega\) ' in a horizontal plane about a smooth fixed vertical axis passing through its center. A particle, also of mass ' \(m\) ' is suddenly attached to the rim of the disc and starts to rotate with it. The new angular speed of this system is

149928 Assertion (A): Angular speed, linear speed as Kinetic energy change with time but angular momentum remains constant for a planet orbiting the sun.
Reason (R): Angular momentum is constant as no torque acts on the planet.

149929 A thin rod of mass ' \(m\) ' and length ' \(2 l\) ' is made to rotate about an axis passing through its centre and perpendicular to it. Its angular velocity changes from 0 to \(\omega\) in time ' \(t\) '. What is the torque acting on the rod?

149926 A wheel of mass \(20 \mathrm{~kg}\) and radius \(30 \mathrm{~cm}\) is rotating at an angular speed of \(80 \mathrm{rev} / \mathrm{min}\) when the motor is turned off. Neglecting the friction at the axis, calculate the force that must applied tangentially to the wheel to bring it to rest in 5 revolution.

149927 A uniform disc of radius ' \(a\) ' and mass ' \(m\) ' is rotating freely with an angular speed of ' \(\omega\) ' in a horizontal plane about a smooth fixed vertical axis passing through its center. A particle, also of mass ' \(m\) ' is suddenly attached to the rim of the disc and starts to rotate with it. The new angular speed of this system is

149928 Assertion (A): Angular speed, linear speed as Kinetic energy change with time but angular momentum remains constant for a planet orbiting the sun.
Reason (R): Angular momentum is constant as no torque acts on the planet.

149929 A thin rod of mass ' \(m\) ' and length ' \(2 l\) ' is made to rotate about an axis passing through its centre and perpendicular to it. Its angular velocity changes from 0 to \(\omega\) in time ' \(t\) '. What is the torque acting on the rod?

149926 A wheel of mass \(20 \mathrm{~kg}\) and radius \(30 \mathrm{~cm}\) is rotating at an angular speed of \(80 \mathrm{rev} / \mathrm{min}\) when the motor is turned off. Neglecting the friction at the axis, calculate the force that must applied tangentially to the wheel to bring it to rest in 5 revolution.

149927 A uniform disc of radius ' \(a\) ' and mass ' \(m\) ' is rotating freely with an angular speed of ' \(\omega\) ' in a horizontal plane about a smooth fixed vertical axis passing through its center. A particle, also of mass ' \(m\) ' is suddenly attached to the rim of the disc and starts to rotate with it. The new angular speed of this system is

149928 Assertion (A): Angular speed, linear speed as Kinetic energy change with time but angular momentum remains constant for a planet orbiting the sun.
Reason (R): Angular momentum is constant as no torque acts on the planet.

149929 A thin rod of mass ' \(m\) ' and length ' \(2 l\) ' is made to rotate about an axis passing through its centre and perpendicular to it. Its angular velocity changes from 0 to \(\omega\) in time ' \(t\) '. What is the torque acting on the rod?

149926 A wheel of mass \(20 \mathrm{~kg}\) and radius \(30 \mathrm{~cm}\) is rotating at an angular speed of \(80 \mathrm{rev} / \mathrm{min}\) when the motor is turned off. Neglecting the friction at the axis, calculate the force that must applied tangentially to the wheel to bring it to rest in 5 revolution.

149927 A uniform disc of radius ' \(a\) ' and mass ' \(m\) ' is rotating freely with an angular speed of ' \(\omega\) ' in a horizontal plane about a smooth fixed vertical axis passing through its center. A particle, also of mass ' \(m\) ' is suddenly attached to the rim of the disc and starts to rotate with it. The new angular speed of this system is

149928 Assertion (A): Angular speed, linear speed as Kinetic energy change with time but angular momentum remains constant for a planet orbiting the sun.
Reason (R): Angular momentum is constant as no torque acts on the planet.

149929 A thin rod of mass ' \(m\) ' and length ' \(2 l\) ' is made to rotate about an axis passing through its centre and perpendicular to it. Its angular velocity changes from 0 to \(\omega\) in time ' \(t\) '. What is the torque acting on the rod?