Question

A block of $\sqrt{3} kg$ is attached to a string whose other end is attached to the wall An unknown force $F$ is applied so that the string makes an angle of $30^{\circ}$ with the wall The tension $T$ is:(Given $g =10 \,ms ^{-2}$ )

• A. $25 N$
• B. $15 N$
• C. $10 N$
• D. $20 N$

Answer 1

Answer: (D)

$20 N$

Answer 2

The correct answer is (D) : $20 N$

$θ=30^∘$
$\cos\ θ=\frac{\sqrt{3g}}{T}$​
$⇒\frac{\sqrt3}{2}​=\frac{\sqrt{3g}}{T}$​
$⇒T=20N$