Asample of 2 moles of an ideal diatomic gas experiences a temperature increase of 60 k at constant volume. (a) find the increase in internal energy if only translational and rotational motions are possible. 8.73 103 j (b) find the increase in internal energy if translational, rotational, and vibrational motions are possible. 0.01222 (c) what fraction of the energy calculated in (b) is translational kinetic energy?