Steel bars, each of length 3.0 m at 28°C, are to be used for constructing a rail line. If the linear expansivity of steel is 1.0 x 10^-5°C, what is the safety gap that must be left between successive bars if the highest temperature expected is 40^oC?

1.2 x 10^-1cm

8.4 x 10^-2cm

7.2 x10^-2cm

3.6 x 10^-2cm

1.8 x 10^-2cm

Correct Option

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3 years ago

can't we use the new school physics method to solve it because i tried and i am getting 7.2×10^-5

10 years ago

The question is wrongly composed:

the linear expansivity value is wrongly written

ceoofwahala

20th June, 2026

Chemistry

2 comments

ASSAAS

20th June, 2026

English Language

5 comments

infinitehoaxx

21st May, 2026

Computer

4 comments

Steel bars, each of length 3.0 m at 28°C, are to be used for constructing a rail line. If the linear expansivity of steel is 1.0 x 10-5°C, what is the safety gap that must be left between successive bars if the highest temperature expected is 40oC?