1.

Calculate the work done per minute by a punch tool making 20 working strokes per min when a 30 mm diametre hole is punched in 5 mm thick plate with ultimate shear strength og 450 Mpa in each stroke.

A. 10.69 kNm
B. 20.69 kNm
C. 30.69 kNm
D. 40.69 kNm
Answer» B. 20.69 kNm


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