Kinematics 6 Question 11

11. Spotlight S rotates in a horizontal plane with constant angular velocity of 0.1 rad/s. The spot of light P moves along the wall at a distance of 3m. The velocity of the spot P when θ=45 (see fig.) is…… m/s.

(1987, 2M)

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Answer:

Correct Answer: 11. 0.6

Solution:

  1. x3=tanθ

x=3tanθ

dxdt=3sec2θdθdt

dxdt=vP and 

dθdt=ω=0.1rad/s,θ=45

Substituting the values, we get

vP=3(sec245)(0.1)=0.6m/s



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