Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Rotational Motion question

2024 · Q166
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Rotational Motion
  5. /2024 · Q166

Rotational Motion question

2024 · Q166

NEETPhysicsRotational MotionMCQ+4 / −1

The moment of inertia of a thin rod about an axis passing through its mid point and perpendicular to the rod is 2400 g cm22400 \mathrm{~g} \mathrm{~cm}^22400 g cm2. The length of the 400 g400 \mathrm{~g}400 g rod is nearly:

  1. A
    8.5 cm
  2. B
    17.5 cm
  3. C
    20.7 cm
  4. D
    72.0 cm
View written solutionFree

Correct answer: A

$$ \begin{aligned} & \text { Moment of inertia of rod }=I=\frac{m \ell^2}{12} \\ & \Rightarrow \quad 2400=400 \frac{\ell^2}{12} \\ & \Rightarrow \quad 72=\ell^2 \\ & \Rightarrow \quad \ell=\sqrt{72}=8.48 \mathrm{~cm} \simeq 8.5 \mathrm{~cm} \end{aligned}$$

PreviousNext

More from Rotational Motion

  • A wheel of a bullock cart is rolling on a level road as shown in the figure below. If its linear speed is v in the direction shown, which one of the following options is correct (P and Q are any highest and lowest points on the… Includes diagram2024 · MCQ
  • The radius of gyration of a solid sphere of mass 5 kg about XY is 5 m as shown in figure. The radius of the sphere is 7​5x​ m, then the value of x is: Includes diagram2024 · MCQ
  • A constant torque of 100 N m turns a wheel of moment of inertia 300 kg m2 about an axis passing through its centre. Starting from rest, its angular velocity after 3 s is :-2023 · MCQ
  • The ratio of radius of gyration of a solid sphere of mass M and radius R about its own axis to the radius of gyration of the thin hollow sphere of same mass and radius about its axis is :-2023 · MCQ
  • The angular acceleration of a body, moving along the circumference of a circle, is :2023 · MCQ
  • An energy of 484 J is spent in increasing the speed of a flywheel from 60 rpm to 360 rpm. The moment of inertia of the flywheel is :2022 · MCQ
  • The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200 rpm to 3120 rpm in 16 seconds. The angular acceleration in rad/s2 is2022 · MCQ
  • The ratio of the radius of gyration of a thin uniform disc about an axis passing through its centre and normal to its plane to the radius of gyration of the disc about its diameter is2022 · MCQ