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Grade: 11
`        A sphere, a cube and a disc made of same material and of equal massesheated to same temperature of 200°C. These bodies are then kept atsame lower temperature in the surrounding, which of these will cool(i) fastest, (ii) slowest, explain.`
one year ago

## Answers : (1)

Satdhruti Paul
19 Points
```							Let their mass be M. Obviously, the one with largest surface area will release heat fastest!Since they are of same material, density is same. D = M/V so V = M/Din Sphere 4/3(pi)R^3 = M/Din Cube a^3 = M/Din disc (pi)r^2*(thickness) = M/D.From here you can proceed by finding R, a & r. Find surface area respectively and check.
```
one year ago
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