Question

Suppose we take a 1 m long uniform bar and support it at the 21 cm mark. Hanging a 0.40 kg mass on the short end of the beam results in the system being in balance. Find the mass of the beam.

Answer 1

The mass of the beam is = 29 kg.

Step-by-step explanation:

A beam with mass 40 kg is shown in figure. Point S is the support point. Point B is the middle point on the beam where mass of the beam acts.

Taking moment about Point S

40 × 21 =
`M_(beam)` × 29

`M_(beam)` = 29 kg

Therefore the mass of the beam is = 29 kg.