Acoin placed 30.8 cm from the center of a rotating, horizontal turntable slips when its speed is 50.8 cm/s.
(a) what force causes the centripetal acceleration when the coin is stationary relative to the turntable?
(a) static friction
(b) inertia
(c) kinetic friction
(d) centrifugal force

(b) what is the coefficient of static friction between coin and turntable?

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?