Please answer Q3 & Q4 Three masses are placed on the x-axis: 0.7 kg at x1 = 0 m,

Question

Please answer Q3 & Q4

Three masses are placed on the x-axis: 0.7 kg at x1 = 0 m, 0.57 kg at x2 = 0.300 m, and 0.54 kg at x3 = 0.700 m. Find the position xCM of the center of mass for these three objects. The position xCM of the center of mass a 0.145 kg ball moving in the +x direction at 20.5 m/s is hit by a bat. Its final velocity of the ball is -26.6 m/s in the -x direction. The acts on the ball for Delta t = 0.010s. Find the average force FAV exerted on the ball by the bat. The average force exerted on the ball by the bat = N

Explanation / Answer

xcm = 0.7 x 0 + 0.57 x 0.3 + 0.54 x 0.7 / ( 0.7 + 0.57 +0.54) = 0.3033

4. impulse = mv = F x time

F x 0.010 = 0.145 x (- 26.6 - 20.5)

F = 682.95 N

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