Joint Entrance Examination/AIEEE 2009/Q087 ENERGY CONSERVATION

Welcome to the Highschool Help Forum!

The forum is currently in "Beta" stage of development. You can ask questions and answer/discuss them. The basic functionalities are present. What's required is a more aesthetic look to the Static pages and a more user friendly setup. This will happen over the time gradually as we start creating some content.

The site has a lot of tools, like posting mathematical calculations, images and diagrams; categorizing questions and so on. Having them here is NO GOOD unless you know how to use them. I am thoroughly against compiling a list of these features and then writing about them. As soon as you do not understand how to do something or use a certain feature, report that on "How To"s Section of the forum. Your queries will be answered there.

If you have any ideas/discussion regarding the site/comments, please go to Discussions regarding Highschool Help Forum

Lastly, thanks for joining in the site's development process! It matters!

Nuvola apps edu miscellaneous.svg

Original Question by

Here's the question...

Q87. A thin uniform rod of length l and mass m is swinging freely about a horizontal axis passing through its end. Its maximum angular speed is ω. Its centre of mass rises to a maximum height of

  • (1)[1/6]Iω/g
  • (2)[1/2]I2ω2/g
  • (3)[1/6]I2ω2/g
  • (4)[1/3]I2ω2/g

Posted by 04:22, 25 September 2009 (UTC)

Post a reply![1]

Nuvola apps krfb.png

What's Up?

Latest discussions on the forum


  1. Joint Entrance Examination/2000 Screening/Q028 Ball dropped from a height, graphs
  2. Joint Entrance Examination/2000 Screening/Q005 Toppling vs Sliding of a cube
  3. Joint Entrance Examination/2000 Screening/Q004 Roatting triangular frame with beads, what quantities are conserved
  4. Joint Entrance Examination/AIEEE 2009/Q083 YOUNGS MODULUS
  5. Joint Entrance Examination/AIEEE 2009/Q087 ENERGY CONSERVATION


  1. Joint Entrance Examination/2000 Screening/Q032 Divergent beam passsing from a glass slab
  2. Joint Entrance Examination/2000 Screening/Q031 Magnetic fields of parallel wires
  3. Joint Entrance Examination/2000 Screening/Q028 Ball dropped from a height, graphs
  4. Joint Entrance Examination/2000 Screening/Q026 Ideal gas and graph of a process
  5. Joint Entrance Examination/2000 Screening/Q023 capcitors and dielectric, equivalent capcitance

Browse All Available Categories

Physics: Introductory PhysicsMechanicsHeatWaves and OscillationsElectricity And MagnetismOpticsModern Physics
Mathematics: AlgebraTrigonometryCo-Ordinate (Analytical) GeometryCalculusVectors And 3D GeometryMiscellaneous Topics
Chemistry: General Chemistry and Physical ChemistryOrganic ChemistryInorganic Chemistry
Biology: General BiologyAnatomyPhysiologyBotanyZoology
a a

Category AIEEE 2009

Reply to the thread, posted by

Thread post

Additional notes

SOLUTION 3 Loss in kinetic energy = Gain in potential energy [1/2]Iω2 =mgh ⇒[1/2][ml2/3]ω2=mgh ⇒h=l2w2/6g

These comments, along with the notes on the left, were contributed by 04:26, 25 September 2009 (UTC)