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Sahay Sir > Question Answers > NCERT Exemplar Class 11 > Physics > Chapter 6 - System of Particles and Rotational Motion > The oxygen molecule has a mass of 5.30×10^−26kg and a moment of inertia of 1.94×10^−46kgm^2 about an axis through its centre perpendicular to the line joining the two atoms. Suppose the mean speed of such a molecule in a gas is 500m/s and that its kinetic energy of rotation is two/thirds of its kinetic energy of translation. Find the average angular velocity of the molecule.

The oxygen molecule has a mass of 5.30×10^−26kg and a moment of inertia of 1.94×10^−46kgm^2 about an axis through its centre perpendicular to the line joining the two atoms. Suppose the mean speed of such a molecule in a gas is 500m/s and that its kinetic energy of rotation is two/thirds of its kinetic energy of translation. Find the average angular velocity of the molecule.

an engine needs to transmit a torque of 180 N m. What is the power required by the engine ? (Note: uniform angular velocity in the absence of friction implies zero torque. In practice applied torque is needed to counter frictional torque). Assume that the engine is 100% efficient. To maintain a rotor at a uniform angular speed of 200 rad s^−1