Homework Help: Physics

Posted by Vladimir on Tuesday, May 29, 2012 at 10:40pm.

Three identical blocks, A, B, and C, are on a horizontal frictionless table. The blocks are connected by strings of negligible mass, with block B between the other two blocks. If block C is pulled horizontally by a force of magnitude F = 28 N, find the tension in the string between blocks B and C.

Physics - Elena, Wednesday, May 30, 2012 at 8:07am
m1=m2=m3 =m,
Total mass = 3 m.
Acceleration of each block
a= F/3•m.

T is the tension in the string between blocks B and C.
T is the pulling force on both masses B and A with an acceleration of a.
T = 2ma = 2•m• F/(3m) = 2/3•F = (2/3) •28 =18.7 N

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