(a) (i) State the principle of moments as applied to the lever shown in Figure. And (ii) calculate its mechanical advantage if AB=2*0m and FA=20cm. (b) Calculate the effort needed to lift and load.

(a) (i) State the principle of moments as applied to the lever shown i

1.	(a) (i) State the principle of moments as applied to the lever shown in Figure. And (ii) calculate its mechanical advantage if AB=2*0m and FA=20cm. (b) Calculate the effort needed to lift and load.
Answer» Solution :(a) (i) By the principle of moments. Load`xx`FA=Effort`xx`FB (ii) Given: `AB=20m,FA=20cm=02M`. FB=AB-FA=`20-02=18m`. `THEREFORE`Mehcanical ADVANTAGE=`("effort arm FB")/("load arm FA")` `=(18m)/(0*2m)=9` (b) Given: load=18 kgf, M.A.=9 Since `M.A.=("load")/("effort")` `therefore`Effort=`("load")/("M.A.)=(18)/(9)=2kgf`.