Express your answer to three significant figures and include appropriate units.

The assembly consists of three disks $A,B,$ and $C$ that are used to support the load of $140kN.($Figure $1)$

The allowable bearing stress for the material is $({}_b{)}_{\text{a}\text{l}\text{l}\text{o}\text{w}}=390$MPa and allowable shear stress is ${}_{\text{a}\text{l}\text{l}\text{o}\text{w}}=127$MPa.

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Review your calculations and make sure you round to $3$ significant figures in the last step.

Part B

Determine the largest diameter $d_2$ of the opening.

Express your answer to three significant figures and include appropriate units.

Figure

$1$ of $1$

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Part C

Determine the largest diameter $d_3$ of the hole in the bottom disk.

Express your answer to three significant figures and include appropriate units.