A riveting machine is driven by a constant-torque 3kW motor. The moving parts including the flywheel are equivalent to 150 kg at 0.6 m radius. One riveting operation takes 1 second and absorbs 10000 N-m of energy. The speed of the flywheel is 300 r.p.m. before riveting. What is the speed (to nearest 10 r.p.m.) after riveting and what is the number of rivets that can be closed per minute?

A riveting machine is driven by a constant-torque 3kW motor. The movin

1.	A riveting machine is driven by a constant-torque 3kW motor. The moving parts including the flywheel are equivalent to 150 kg at 0.6 m radius. One riveting operation takes 1 second and absorbs 10000 N-m of energy. The speed of the flywheel is 300 r.p.m. before riveting. What is the speed (to nearest 10 r.p.m.) after riveting and what is the number of rivets that can be closed per minute?
A.	260 r.p.m. and 18
B.	290 r.p.m. and 15
C.	360 r.p.m. and 18
D.	390 r.p.m. and 15
Answer» B. 290 r.p.m. and 15