1.) two masses are placed at different points along the meterstick of negligible

Question

1.) two masses are placed at different points along the meterstick of negligible mass: 0.250kg at 0.200m and 0.500kg at 0.500m wheres the center of mass of this system?

2.) On a seesaw, a 28-kg child sits 2.8 m from the pivot point. Where should a 38-kg child sit to put the center of mass at the pivot?

3.) A billiard ball moving at 1.65 m/s in the +x-direction collides with an identical ball initiially at rest. After the collision, one ball moves off at 45 degrees above the x-axis. Find both ball's post-collision velocities.

Explanation / Answer

1 ) 0.25*0.2 +0.5*0.5/ (0.25+0.5) = 0.428 m

2)

28 *2.8 = 38*x
x = 2.06 m frompivot

3)

m*1.65 = 2*m*V *cos45

v = 1.166 m/s

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