10. [-/7.69 Points] DETAILS SERPSE10 19.6.0P.026. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER At midday when a black grain storage facility is directly under the Sun, it receives 925 W of solar power per square meter of surface from the Sun. If this hot surface loses energy only by radiation back into the atmosphere, what is its equilibrium temperature (in K)? You may use an emissivity of e = 1 for a black surface. ( Ik e ) Need Help? Submit Answer 11. [-/7.69 Points] SERPSE10 19.A.0P.037. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An aluminum wheel rubs against an aluminum plate in such a manner that there is a 51.0 N force of kinetic friction between them, and the relative speed at which the two surfaces slide over each other is 43.0 m/s. The specific heat for aluminum is 900 J/(kg - C). {(a) Determine the rate at which mechanical energy is converted to internal energy (in W). |w - {b) If the wheel and plate each have a mass of 7.00 kg and they each receive half the internal energy from a 13.0 s run, determine the resultant temperature increase (in *C) of each after they have been given time to reach a uniform temperature. 7 J\"C Need Help? [ Readit ] Submit Answer 12. [-/7.72 Points] DETAILS SERPSE10 19.A.P.036. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Two speeding lead bullets, one of mass 13.0 g moving to the right at 320 m/s and one of mass 7.95 g moving to the left at 385 m/s, collide head-on, and all the material sticks together. Both bullets are originally at temperature 30.0C. Assume the change in kinetic energy of the system appears entirely as increased internal energy. We would like to determine the temperature and phase of the bullets after the collision. (Lead has a specific heat of 128 1/(kg K}, 2 melting point of 327.3C, and a latent heat of fusion of 2.45 x 10% J/kg.) {a) What analysis model is appropriate for the system of two bullets for the time interval from before to after the collision? () particle in equilibrium () isolated system (momentum) (O nonisolated system (momentum) () particle under a net force (b) From the model, what is the speed of the combined bullets after the collision? | Tmy/s (c) How much of the initial kinetic energy has transformed toe internal energy in the system after the collision? r ~ | ] {d) Does all the lead melt due to the collision? O Yes ) No {e) What is the temperature of the combined bullets after the collision? L ) . (f) What is the phase of the combined bullets after the collision? Mhulet,solid = | )9 Moulletliquid ~ L 198 Need Help? Submit