(b) A probe and an asteroid collide in space. A disc made of copper, of diameter 56 m and thickness 1.2 m at a temperature of 850°C, is dislodged from the probe and floats freely in space, rotating about its axis of symmetry with an angular speed w = 25 rad s-1. The disc radiates heat, and its temperature falls to 20°C. Assume that no external torque acts on the disc. Find: (i) the change in kinetic energy of the disc, given the disc radius shrinks by an amount Ar (aXouAT")r; for a temperature change AT, where r, is the initial radius and au = 1.67 × 10-5 °C-1; (ii) the change in internal energy of the disc; and (iii) the amount of energy radiated by the disc.

(b) A probe and an asteroid collide in space. A disc made of copper, of diameter 56 m and thickness 1.2 m at a temperature of 850°C, is dislodged from the probe and floats freely in space, rotating about its axis of symmetry with an angular speed w = 25 rad s-1. The disc radiates heat, and its temperature falls to 20°C. Assume that no external torque acts on the disc. Find: (i) the change in kinetic energy of the disc, given the disc radius shrinks by an amount Ar (aXouAT")r; for a temperature change AT, where r, is the initial radius and au = 1.67 × 10-5 °C-1; (ii) the change in internal energy of the disc; and (iii) the amount of energy radiated by the disc.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.26P

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