Posted by Sally on Wednesday, October 3, 2012 at 9:49am.
total mass accelerated = 39+21 = 60 kg
total force accelerating = (39-21)g = 18*9.81 = 177 N
a = F/m = 177/60 = 2.95 m/s^2
total force up on little mass = 21 * acceleration up
T - 21(9.81) = 21(2.95)
T = 21 (12.76) = 268 N
check
total force down on big mass = 39*.34 ??
39*9.81 - T = 39(2.95)?
383 - 268 = 115 ?? Yes, good
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