I haven't studied about logs yet

Classical Mechanics Level 2

A log of wood is led at the ground as in the fig (a) what will the change in potential energy in position (b) as compared to (a). If the mass of the log is 500 kg and its length is 20 m. (Assume that initial potential energy is 0 .)

48000 J 50000 J 51000 J 49000 J

Manish Mayank by Manish Mayank , 20, India

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2 solutions

Manish Mayank
Jul 16, 2014

The potential energy is measured from the center of mass. So we will take height = 10m

3 Helpful 0 Interesting 0 Brilliant 0 Confused

the value of g is 9.8

Indrajeet Singh - 6 years, 10 months ago

please mention the value of gravitational constant....

G S S P KUMAR DWARAPUREDDY - 6 years, 10 months ago

holy shit i took g = 10

akash deep - 6 years, 8 months ago

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Same here dude! Thats unfair!

Pranjal Jain - 6 years, 8 months ago

Nice explanation!!!

Sahba Hasan - 6 years, 8 months ago
Godwin Tom George
Sep 25, 2014

The increase in PE is equal to the work done.

W=(mgl)/2 .(by integrating)

Let g=9.8,knowing the value of m,g,l.We can calculate PE

PE=49000J

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