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$l=change in length $l/l=f/ay (hookes law) a=area also $l/l=f/ay+@$t @=coefficient of thermal expansion..! how to know when to use what..? can we use $l/l=@$t or f/ay+@$t=0..?

$l=change in length
$l/l=f/ay (hookes law)
a=area
also $l/l=f/ay+@$t
@=coefficient of thermal expansion..!
how to know when to use what..?
can we use $l/l=@$t
or f/ay+@$t=0..?

Grade:12

2 Answers

Sumit Majumdar IIT Delhi
askIITians Faculty 137 Points
9 years ago
Hello student,
Can you instead upload a scanned question.
What I understand from the question is that you want to know which relation you should use when you have thermal expansion and when you expansion under Hooke’s Law.
Hooke’s Law is valid when the expansion takes place under the weight of the body iytself.
The Thermal expansion rule is applied when you give heat to the object and under that heat the object expands.
Thanks & Regards
Sumit Majumdar,
askIITians Faculty
Ph.D,IIT Delhi
Sumit Majumdar IIT Delhi
askIITians Faculty 137 Points
9 years ago
Dear student,
You can use the hooke’s law when there is an extension of the length or the string/mass/object but if there is some amount of heat supplied, in that case the coefficient of thermal expansion needs to be applied.
Regards
Sumit

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