Circular Motion

Practice Questions:

Question 1: difficult

A spot light S rotates in a horizontal plane with a constant angular velocity of 0.1 rad/s. The spot of light P moves along the wall at a distance of 3 m. The velocity of spot P when θ = 45° is :-

1. 0.2 m/s

2. 0.3 m/s

3. 0.6 m/s

4. 0.8 m/s

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Question 2: difficult

Three identical particles are joined together by a thread as shown in figure. All the three particles are moving in a horizontal plane. If the velocity of the outermost particle is v₀, then the ratio of tensions in the three sections of the string is :

1. 3 : 5 : 7

2. 3 : 4 : 5

3. 7 : 11 : 6

4. 3 : 5 : 6

View Answer

T _c = mω²(3l)= 3mω²

T _B = mω²(2l) + T _c = 5mω²l
T _A = mω²(l) + T _B = 6mω²l
So,
T _C : T _B : T _A = 3:5:6

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