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A particle of weight 24 N is held in equilibrium by two light inextensible strings - Edexcel - A-Level Maths Mechanics - Question 1 - 2007 - Paper 1

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A particle of weight 24 N is held in equilibrium by two light inextensible strings. One string is horizontal. The other string is inclined at an angle of 30° to the ... show full transcript

Worked Solution & Example Answer:A particle of weight 24 N is held in equilibrium by two light inextensible strings - Edexcel - A-Level Maths Mechanics - Question 1 - 2007 - Paper 1

Step 1

a) the value of P

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Answer

To find the value of P, we analyze the vertical components of the forces acting on the particle. The weight of the particle is acting downwards, and the component of the tension P acting vertically can be expressed using the sine function:

Psin30°=24P \sin 30° = 24

Now, solving for P:

  1. Calculate sin30°=12\sin 30° = \frac{1}{2}.
  2. Substitute and rearrange: P12=24P \cdot \frac{1}{2} = 24 P=24×2=48P = 24 \times 2 = 48

Thus, the value of P is 48 N.

Step 2

b) the value of Q

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Answer

Next, we find the value of Q using the horizontal components of the forces. The horizontal component of tension P can be expressed as follows:

Q=Pcos30°Q = P \cos 30°

Now, we substitute the known value of P along with the cosine function:

  1. Calculate cos30°=32\cos 30° = \frac{\sqrt{3}}{2}.
  2. Substitute in the value of P: Q=4832=243Q = 48 \cdot \frac{\sqrt{3}}{2} = 24\sqrt{3}
  3. For an approximate value, 31.732\sqrt{3} \approx 1.732, therefore: Q24×1.73241.6Q \approx 24 \times 1.732 \approx 41.6

Thus, the value of Q is approximately 41.6 N.

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