The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to__________________?

A. Wsin(a + )

B. Wcos(a + )

C. Wtan(a-)

D. Wtan(a + )

E. W (sin a + cos ).

Be the first to comment if anything wrong with this mcq
Your comment successfully submitted!
It will automatically posted after review and approval by our staff member.