Question 106: Laws of Motion

Question

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

Accepted Answer

Drawing the FBD of the point where $$F$$ is applied
$$T' = \sqrt 3 g$$
$$ \Rightarrow T\cos 30^\circ  = \sqrt 3 g$$
$$ \Rightarrow T = 2g = 20$$ N

Answer

15 N

Answer

10 N

Answer

25 N

Answer

20 N

Laws of Motion

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

Choose the correct answer: