question_answer

In the figure shown, the tension in the horizontal cord is 30N. Find the weight of the body B:                              

A) 40N                 

B) 30N   

C) 20N                 

D) 10N

Correct Answer: C

Solution :

[c] \[T\text{ }cos\text{ }45{}^\circ =Mg\] \[\frac{T}{\sqrt{2}}=W\] \[W=\frac{30}{\sqrt{2}}=15\sqrt{2}(T=30N)\] \[W=20N\]