The yield strength of a copper alloy is 50 MPa. A 20-gram
diamond is placed on it, with a pyramid-shaped tip against the
copper surface. The diamond will :
A) be damaged
B) leave a dent of about 63.2 microns in copper
C) leave a dent of about 36.5 microns in copper
D) not damage the copper at all
Please kindly answer and provide explanation or working. Thank
you.