Three blocks of masses 3m, 2m, ands are connected to strings A, B, and C as show

Question

Three blocks of masses 3m, 2m, ands are connected to strings A, B, and C as shown above. The blocks are pulled along a rough surface by a force of magnitude Fexerted by string C. The coefficient of friction between each block and the surface is the same. Which string must be the strongest in order not to break? 2m A. they must al be the same strength it is impossible to determine without knowirg the cocffiecient of friction Question 14 5.2631579 pts An abject weighing 300 N is suspended by means of two cords, as shown above. The

Explanation / Answer

mAa = Ta - umAg

mBa = TB - TA - umBg

mAa = F - TB - umCg

F = (mA + mB + mC)a = 6ma

then

a = F/(6m)

TA = mAa + umAg = 1/2F + 3umg

TB = Ta + mBa + umBg = 1/2F + 3umg + 1/3F + 2umg = 5/6F

TC = F = TB + mAa + umAg = 5/6F + 5umg + F/6 + umg = F + 6u

then

TC > TB > TA

the correct answer is C

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