## 60 Unit 7 Practice and Assessment

#### Outcome 1

1) A person with a weight of 715 N  hangs from a climbing rope 9.2 mm in diameter.

a) What is the of the rope in m2?

b) What is the applied to the rope?

2) A particular 60 climbing rope stretches by 0.15 when a 715 N person hangs from it.

a) What is the in the rope?

b) What is the strain in the rope as a percentage?

3) Label the following features in the stress-strain curve of a hypothetical material seen below:

• Toe region
• Elastic region
• Yield point
• Plastic Region
• Ultimate Strength
• Rupture Point
• Failure Region

#### Outcome 2

4) Use the data in the previous graph to determine the of the hypothetical material. Be sure to convert the strain from  % stretch back to fractional stretch before doing your calculations.

#### Outcome 3

5) Answer the following questions regarding the material used to create the created the stress-strain graph above.

a) How much force could be applied to a 2 m x 2 m x 10 m long block of this material before reaching the ?

b) When operating in the , how much additional stress would be required to cause an additional  strain of 0.01?

c) What force would cause that amount of stress you found in part b on the 2 m x 2 block?

d) What actual length would the 10 m long material stretch when put under the strain of 0.01?

e) What is the effective of this 2 m x 2 m x 10 m long block of this material?