Question

(b) Fig. 3. 1 shows a uniform iron bar B of weight 30 N and length 1 40m The bar is being used to
lift one edge of a concrete slab S.A stone placed 0 20m from one end of B acts as a pivot
A force of 40 N pushing down at the other end of B is just enough to lift the slab and hold it as
shown
1.40m
0 20m
force 40N
concrete slab
iron bur B
stone
Fig. 3.1

Answer 1

Answer:

65nm

Explanation:

A force of 40 N pushing down at the other end of B is just enough to lift the slab and hold it as   1.40m  0 20m  force 40N  concrete slab  iron bur B  stone