Question

Can someone please help!!

Answer 1

Weight needed to balance the bar is
`8.5N`

Step-by-step explanation:

Given the weight of the bar is
`8N`

The length of the bar is
`5m`

The weight of the bar will be uniformly distributed over the entire span. We will consider this as a point load acting in the middle of span length, which is at a distance of
`2.5m` from both ends.

Now applying momentum equation about balanced load we get, (see attachment)

`\sum m_i=0\\2(m)+8(1)-8(0.5)-7(3)=0\\2m+8-4-21=0\\2m-17=0\\2m=17\\m=(17)/(2)=8.5\\So,\ m=8.5N`