Asteel wire has a cross sectional area of 1.5 x 10^-4 cm^2 and a length of 10.0 m. by how much will it stretch if a 25 kg weight is hung from it? answer in millimeters.

The steel wire will stretch up to 1837.5 mm

Explanation:

We are given:

Mass = 25 kg

Length of wire = 10 m

Area of cross-section of wire =    (Conversion factor:   )

To calculate the change in stretching, we use the equation:

where,

E = young modulus of steel =

F = force exerted by the weight = m g =

l = length of wire = 10 m

A = area of cross section =

= change in length = ?

Putting values in above equation, we get:

Converting above value in mili meters, we use the conversion factor:

1 m = 1000 mm

So, 1.8375 m = 1837.5 mm

Hence, the steel wire will stretch up to 1837.5 mm

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.