If the specimen is loaded until it is stressed to 65 ksi, determine the approximate amount of elastic recovery after it is unloaded. express your answer as a length. express your answer to three significant figures and include the appropriate units.

ER = 0.008273 in

Explanation:

Given:

- Length of the specimen L = 2 in

- The diameter of specimen D = 0.5 in

- Specimen is loaded until it is stressed = 65 ksi

Find:

- Determine the approximate amount of elastic recovery after it is unloaded.

Solution:

- From diagram we can see the linear part of the curve we can determine the Elastic Modulus E as follows:

                                  E = stress / strain

                                  E = 44 / 0.0028

                                  E = 15714.28 ksi

- Compute the Elastic strain for the loading condition:

                                  strain = loaded stress / E

                                  strain = 65 / 15714.28

                                  strain = 0.0041364

- Compute elastic recovery:

                                   ER = strain*L

                                   ER = 0.0041364*2

                                   ER = 0.008273 in

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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