Question

Q6
The length of a metal is fy when the tension in
it is T, and is l2 when the tension is T2. The
original length of the wire is ​

Answer 1

Answer:

l

Δl

=

AY

F

Thus,

l

l

1

−l

=

AY

T

1

and

l

l

2

−l

=

AY

T

2

Solve the 2 equations to get,

AY=

l

1

−l

T

1

l

,givingT

2

l(l

1

−l)=T

1

l(l

2

−l)

orl=

T

2

−T

1

T

2

l

1

−T

1

l

2