Question

load arm = 15 cm and effort arm
30 cm​

Answer 1

Explanation:

(a)    It is second class lever

(b)    Diagram is above

 

Load and effort are in opposite direction

M.A=effortrequiredLoadlifted=EL=59=1.8

V.R=distancemovedbyloaddistancemovedbyeffort=ηM.A

(c)     If efficiency is η=100%=1

η=V.RM.A

V.R=11.8=1.8

(d)    If efficiency is η=50%=0.5

η=V.RM.A

V.R=0.51.8=3.6