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Indian Navy SSR Systems of Particles and Rotational Motion — practice questions

Explore 3 free Systems of Particles and Rotational Motion questions in Indian Navy SSR Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Systems of Particles and Rotational Motion questions and exercises with answers

Showing questions 1–3 of 3.

As per your syllabus, when the origin of coordinates is chosen at the centre of mass, what does Σ m_i r_i equal?Read the answer and worked solution →As per your syllabus, a wheel spins up from 1200 rpm to 3120 rpm in 16 s. The angular acceleration is approximately which?Read the answer and worked solution →As per your syllabus, the work done by an external torque equals which?Read the answer and worked solution →

Worked practice questions

As per your syllabus, when the origin of coordinates is chosen at the centre of mass, what does Σ m_i r_i equal?

  1. M times CM position
  2. Half of total mass
  3. Total moment of inertia
  4. Zero
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Correct answer: D. Zero

Your syllabus / eqn 6.4d: by definition of CM, Σ m_i (r_i − R) = 0 ⇒ Σ m_i r_i = 0 if origin at CM.

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As per your syllabus, a wheel spins up from 1200 rpm to 3120 rpm in 16 s. The angular acceleration is approximately which?

  1. 4π rad/s²
  2. 2π rad/s²
  3. 8π rad/s²
  4. 16 rad/s²
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Correct answer: A. 4π rad/s²

syllabus Ex 6.11: ω₀ = 40π rad/s, ω = 104π rad/s; α = (104π − 40π)/16 = 4π rad/s².

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As per your syllabus, the work done by an external torque equals which?

  1. Heat dissipated
  2. Loss due to friction
  3. Zero in steady rotation
  4. The change in rotational KE
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Correct answer: D. The change in rotational KE

Your syllabus: no internal motion, no friction ⇒ τω = d/dt((1/2)Iω²) ⇒ W_ext = ΔK_rot. Work-energy theorem in rotation.

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