The screw below has a pitch of a screw thread of 10 mm ("two start" thread). The handle is 300 mm long. An effort of 250 N is applied to the handle. If the efficiency of the jack due to the friction within the lifting threads is 50%, how many tonnes can it lift?

The screw below has a pitch of a screw thread of 10 mm ("two start" thread). The handle is 300 mm long. An effort of 250 N is applied to the handle. If the efficiency of the jack due to the friction within the lifting threads is 50%, how many tonnes can it lift?

The screw below has a pitch of a screw thread of 10 mm ("two start" thread). The handle is 300 mm long. An effort of 250 N is applied to the handle. If the efficiency of the jack due to the friction within the lifting threads is 50%, how many tonnes can it lift?




A. 1 tonne

B. 1.2 tonnes

C. 2.4 tonnes

D. 3.6 tonnes

E. 2.8 tonnes


Answer: B


Learn More :