A sphere of density d,specific capacity c and radius r is hung by a thermally insulating thread in an enclosure which is kept at a lower temperature than the sphere. The temperature of the sphere starts to drop at a rate which depends upon temperature difference between the sphere and the enclosure and the nature of surface of sphere and is proportional to 1. c/r^3d2. 1/r^3dc3. 3r^3dc4. 1/rdc

Nilay , 7 Years ago

Grade 12