Why would drilling a hole at the end of a crack prevent crack propagation?

Are cold work metals suitable for high-temperature service? Why or Why not? Provide a clear explanation on what happens in the material by explaining the start and end microstructure.

This is an example of an essay question. Use the text-entry field below to write a paragraph to submit as your answer.

You convert cyclopentane into pentane and generate the following rate data: T(K) k (s-1) 750 1.8 x 10-4 850 2.7 x 10-3 900 3.0 x 10-2 950 0.26 From the data and plot, determine the order and calculate the activation energy for the reation.

Match the following terms with their definition/meaning.

Q34.png WRITE IN THE ANATOMICAL PARTS FROM THE DIAGRAM: A:  B:  C:  D:  E:  F: G:  

Fill in the blanks for the following motions, muscles, plane of motion and axis of motion:   If I pick up a grocery bag with my palm facing up: the motion that is occurring at my elbow is , which is occurring in the plane of motion using the axis of motion and the primary muscle being targeted with this grip is the .   If I kick a soccer ball: the motion that is occurring at the knee as the foot is making contact with the ball is , which is occurring in the plane of motion using the axis of motion and the primary muscle group being targeted with this motion is the .    If I am doing a Russian twist: the motion that is occurring through the trunk is , which is occurring in the plane of motion using the axis of motion and the primary muscles being targeted with this motion are the .    If I am doing a jumping jack, during the “out” phase of bringing the hands away from the body: the motion that is occurring at the shoulder is , which is occurring in the plane of motion using the axis of motion and the primary muscle being targeted at the shoulder with this motion are the . 

What is the direction of roll when the CONVEX surface is moving on a concave surface?

The two muscles that assist with shoulder extension, internal rotation, and adduction are:

Which muscles belong to the adductor group? Select all that apply.