In the figure, two blocks, of masses 2.00 kg and 3.00 kg, are connected by a lig

Question

In the figure, two blocks, of masses 2.00 kg and 3.00 kg, are connected by a light string that passes over a frictionless pulley of moment of inertia 0.00400 kg · m2 and radius 5.00 cm. The coefficient of friction for the tabletop is 0.300. The blocks are released from rest. Using energy methods, find the speed of the upper block just as it has moved 0.600 m.


Figure looks like this:

3 kg mass horizontal across top - over pull and directly down over pully at 90 deg angle with 2kg mass hanging freely

Explanation / Answer

T1 = mg - ma = 2g - 2a

T2 = mg? + ma = 3g*0.3 + 3a

Fnet = T1 - T2 = 2g - 2a - 3a - 3*0.3g

Fnet = 1.1g - 5a

v = ?(2as)

v = ?(2*1.635*0.6)

v = 1.4007 m/s <--- ans.

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