Question
Question: A sphere, a cube and a thin circular plate, all of same material and same mass, are initially heated...
A sphere, a cube and a thin circular plate, all of same material and same mass, are initially heated to same high temperature.
A
Plate will cool fastest and cube the slowest.
B
Sphere will cool fastest and cube the slowest.
C
Plate will cool fastest and sphere the slowest.
D
Cube will cool fastest and plate the slowest.
Answer
Plate will cool fastest and sphere the slowest.
Explanation
Solution
The circular plate maximum surface area and as such it cools the fastest. For a given volume (mass in this case), a sphere has the least surface area and accordingly cools the slowest.