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A stone is suspended from the free end of a wire that is wrapped around the outer rim of a pulley, as shown in the figure (see the figure (Figure 1) ). The pulley is a uniform disk with mass 10.1kg and radius 51.0cm and turns on frictionless bearings. You measure that the stone travels a distance 12.8m during a time interval of 3.40s starting from rest.

Part A

Find the mass of the stone.

Take the free fall acceleration to be 9.80m/s2.

Part B

Find the tension in the wire.

Take the free fall acceleration to be 9.80m/s2.

Added Thu, 02 Jul '15

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For a uniform disk, I = k*m*R^2 where k = 0.5

a = 2y/t� = 2*12.8/3.40� = 2.2145 m/s�

2) T = k*m*a where m is the mass of the disk; T = 0.5*10.1*2.2145 = 11.1833 N

1) M = T/(g - a) = 11.1833/(9.8 - 2.2145) = 1.4742 kg

Added Thu, 02 Jul '15

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