Three solid objects of the same material and of equal mass –
a sphere, a cylinder (length = diameter) and a cube – are at
5000C initially. These are dropped in a quenching bath
containing a large volume of cooling oil each attaining the
bath temperature eventually. The time required for 90%
change of temperature is smallest for
a) cube
b) cylinder
c) sphere
d) equal for all the three
whyyyyyyy???????
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Answer Posted / vinay upadhyay
answer (d) is correct . because here change of tempr is depend on characteristic length of object and according to ques characteristic length of each will same so their gainig of 90% of tempr difference will requires same time . tou =row *characteristic length*heat capacity /heat transfer cofficient
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