Aflywheel (a rotating object spun up to store energy) is a circular cylinder with a mass of 1,000 kg and 1.0 m radius is rotating at 500 rpm (rotations per minute) a. how much energy is stored in the flywheel? a brake pad with a coefficient of kinetic friction of 1.0 is pressed against the outer surface the flywheel with a normal force of 100 n b. what is the angular acceleration on the flywheel? c. how much time will it take to stop the flywheel?

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?