JAMB - Physics (2008 - No. 41)
The diagram above shows a plank RS pivoted its center of gravity O and is in equilibrium with the weight P and Q. If a weight 2P is added to P the plank will be in equilibrium again by?
moving Q nearer to O
moving P nearer to O
addding a weight Q to Q
moving P further away from O
설명
If 2P is added P, the beam will bend at R side. So to keep it in equilibrium. P should be moved nearer to 0