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QJEEM19Phc927: JEE Main 2019 Physics - Class 11 JEEM19Phc927 Solution: A rigid massless rod of length 3l has two masses attached at…

A rigid massless rod of length 3l has two masses attached at each end as shown in the figure. The rod is pivoted at point P on the horizontal axis (see figure). When released from initial horizontal position, its instantaneous angular acceleration will be -

JEE Main 2019 (Online) 10th January Evening Slot Physics - Rotational Motion Question 172 English

Multiple Choice Options

  • A g13l
  • B g2l
  • C g3l
  • D 7g3l

Step-by-Step Verified Solution

JEE Main 2019 (Online) 10th January Evening Slot Physics - Rotational Motion Question 172 English Explanation
Applying torque equation about point P.

2M0 (2l) − 5 M0 gl = Iα

I = 2M0 (2l)2 + 5M0 l2 = 13 M0l2d

∴  α = − M0gl13M0ℓ2 ⇒ α = − g13ℓ

∴  α = g13ℓ anticlockwise

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