According to one set of measurements, the tensile strength of hair is 196 mpa , which produces a maximum strain of 0.380 in the hair. the thickness of hair varies considerably, but let's use a diameter of 50.0 î¼m
part a
what is the magnitude of the force giving this tensile stress?
f = ? n

part b
if the length of a strand of the hair is 12.0 cm at its breaking point, what was its unstressed length? original length = ? cm

(a). The magnitude of the force is 0.38416 N.

(b). The original length is 0.0869 m.

Explanation:

Given that,

Tensile strength = 196 MPa

Maximum strain = 0.380

Diameter = 50.0 μm

Length = 12.0 cm

We need to calculate the area

Using formula of area

Put the value into the formula

We need to calculate the magnitude of the force

Using formula of force

Put the value into the formula

(b). If the length of a strand of the hair is 12.0 cm at its breaking point

We need to calculate the unstressed length

Using formula of strain

Put the value into the formula

Length after expansion is 12 cm

We need to calculate the original length

Using formula of length

Put the value into the formula

Hence, (a). The magnitude of the force is 0.38416 N.

(b). The original length is 0.0869 m.

answer; ///i do believe that the correct answer is ; ///(physical change);

the answer is 3.1 his answer is wrong mines is right