The foreman in the pressworking section comes to you with the problem of a blanking operation that is producing parts with excessive burrs. (a) what are the possible reasons for the burrs, and (b) what can be done to correct the condition?

There are many reasons can be happened behind it. But some specific reasons can be related to the problem

A) Reason for excessive burrs areas :  

B) To correct the problem

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.