Question

A uniform rod of length $60cm$ and mass $6kg$ is acted upon by two forces as shown in the diagram. The force exerted by $45cm$ part of the rod on $15cm$ part of the rod is

• A. $9N$
• B. $18N$
• C. $27N$
• D. $30N$

Answer 1

The correct option is A $9N$

The force exerted by $45cm$ part of the rod on $15cm$art of the rod is given as,

$F=F_1\times \frac{15}{60}+F_2\times \frac{45}{60}$

$F=21\times \frac{15}{60}+45\times \frac{45}{60}$

$F=45\times \frac{15}{60}+21\times \frac{45}{60}$

$F=27N$