Car b is initially stationary and is struck by car a moving with initial speed v1 = 20 mi / hr. the cars become entangled and move together with speed v′ after the collision. if the time duration of the collision is 0.1 sec, determine (a) the common fi nal speed v′, (b) the average acceleration of each car during the collision, and (c) the magnitude r of the average force exerted by each car on the other car during the impact. all brakes are released during the collision

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?