An open belt drive connects two pulleys 1.2 m and 0.5 m diameter, on parallel shafts 4 m apart. the mass of the belt is 0.9 kg/m length and the maximum tension is not to exceed 2000 n. the coefficient of friction is 0.3. the 1.2 m pulley, which is the driver, runs at 200 r. p.m. due to belt slip on one of the pulleys, the velocity of the driven shaft is only 450 r. p.m. calculate the torque on each shaft, ii. the power transmitted, and iii. power lost due to friction.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?