You are asked to construct a mobile with four equal m = 141 kg masses, and three light rods of negligible mass and equal lengths. the rods are of length 55 cm. (a) at what location on the level 1 rod should the free end of rod 2 be attached?

The free end must be attached at a distance of 27.5 cm

Solution:

Mass, m = 141 kg

Length of the rods, L= 55 cm

Now,

As clear from fig. 1:

The free end of the rod 2 must be attached at:

F = 2 W

2L = 55

L = 27.5 cm

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible