Question

the length of a brass bar is 150cm in 40°c. find its length in 100°c​

Answer 1

Answer:

Answer

We know, l

2

​

−l

1

​

=α×l

1

​

×t, where l

1

​

= initial length, and l

2

​

= final length; t= temperature difference (as initial temperature = 0)

Now final length for steel and brass rod will be same.

Generally written, l

2

​

=l

1

​

(1+αt)

l

2

​

for brass = l

2

​

for steel

150(1+18×10

−6

×t)=150.2(1+12×10

−6

×t)

Solving we get, t=222.8163 degree centigrade

Explanation: