First slide

Equilibrium of a particle

Question

Find the reading of spring balance (in N) as shown in figure. Assume that mass M is in equilibrium.

Moderate

Solution

$\begin{array}{l} N = m g \cos 37^{\circ} \\ N = 2.5 \times 10 \times \frac{4}{5} \\ N = 20 N \end{array}$
Reading of spring balance,
$\begin{array}{l} R = N \cos 53^{\circ} \\ R = 20 \times \frac{3}{5} \\ R = 12 N \end{array}$

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