A machine is to punch a 25-mm diameter hole from a 19 mm thick steel plate having an ultimate shear strength of 400 MPa.

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A machine is to punch a 25-mm diameter hole from a 19 mm thick
steel plate having an ultimate shear strength of 400 MPa. A
flywheel is to be designed with a mean diameter of 1 meter, a
maximum operating speed of 200 rpm, and a coefficient of
fluctuation of 0.1. The flywheel’s hub and arms’ weight may be
taken to be 10% of the rim’s weight. The width of the rim is to be
five times its thickness. Calculate the energy left in kJ right
after punching a hole.
a. 25.5
b. 5.72
c. 57.2
d. 2.55