A jack having 2 cm as the diameter of the screw at the root of the thread, may be expected to safely lift a load of about

A jack having 2 cm as the diameter of the screw at the root of the thr

1.	A jack having 2 cm as the diameter of the screw at the root of the thread, may be expected to safely lift a load of about
A.	25 to 30 tonnes
B.	5 to 7 tonnes
C.	35 to 40 tonnes
D.	40 to 50 tonnes
Answer» D. 40 to 50 tonnes