Ma fol frums is 30.48cm. and the roll pom are 100, What wal be the power roqulred for Ihis oparalion (h=3000 and n=02y ? 2. The workploce has a flow ourve defined by K=300 MPa and n=0.2, and the cadifient af trictan betwoen the rolls and the work ls assumed to be 0.1. A 25-cm-1ide strip 20mim thick is fed through a rolling mill with two powered rolls each of radus =300 mm. The wark thickness is to be roduced to 18mm in one pass at a roll speed of 80 rev/min. What Will be the rall force of this operation? 3. A billet 8.5cm long and 20mm in dlameter ls lo be extruded in a direct extrusion operation with exirusion ratio ol 3. The extrudate has a round coss section. The die angle (half angle) = 90 degrees. The work metal has a strength edefieient = 375 MPa, and strain harderting exporant =0.17. Use the Johnsan formula with a =0.9 and b=1.4 to estintate extrusion strair. The pressure applied to the end of the billel as the ram moves forward will be? 4. The work inaterial has a flow curve defince by k m 300 MPa and n=0.2, and the coefficent of frotion between the rolls and the work is assumed lo be 0.1. A 250-mmwide strip 2.0 ent thick is fed through a ralling rill with two powered rolls each of radius = 300 mrrm. The work. thitekness is to be reduced to 18mm in one pass at a roll speed ol 50 revimin. What will be tina thor sepawer ol this operation? 5. Wire is drawn through a draw die with entrance angle 20 dagrees. Starting diameter is 0.25 cm sind fintal dlarmetar -20 mmm. The cod licient of ficlion at the work-die interface 0.06. The metal hea a strenglh owalfictent K. 250MP a and a sirain hardening exponent If 0.20. The diraw slress in tife eperabori will be