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Standard IX

Physics

Second Law of Motion

A 5m long p...

Question

A $5 m$ long pole of $3 k g$ mass is placed against a smooth vertical wall as shown in the figure. Under equilibrium condition, if the pole makes an angle of $37^{o}$ with the horizontal, the frictional force between the pole and horizontal surface is $4 p N$ . Find the value of $p$ :

6 N

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3 N

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20 μ N

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30 μ N

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Solution

The correct option is A $6 N$
Frictional force in this case is opposite and equal to the horizontal component of weight.

$m g cos θ = 4 p N$

$p = \frac{3 \times 10 \times 4}{4 \times 5} = 6 N$

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A 5m long pole of 3kg mass is placed against a smooth vertical wall as shown in the figure. Under equilibrium condition, if the pole makes an angle of 37o with the horizontal, the frictional force between the pole and horizontal surface is 4pN . Find the value of p:

The correct option is A 6NFrictional force in this case is opposite and equal to the horizontal component of weight. mgcosθ=4pN p=3×10×44×5=6N

A $5 m$ long pole of $3 k g$ mass is placed against a smooth vertical wall as shown in the figure. Under equilibrium condition, if the pole makes an angle of $37^{o}$ with the horizontal, the frictional force between the pole and horizontal surface is $4 p N$ . Find the value of $p$ :

The correct option is A $6 N$
Frictional force in this case is opposite and equal to the horizontal component of weight.

$m g cos θ = 4 p N$

$p = \frac{3 \times 10 \times 4}{4 \times 5} = 6 N$