Answer to Question #215388 in Physics for Lisa

Question

A pulley system has two frictionless disks, whose radii are d1 = 17 cm and d2 = 28 cm, respectively. The disks have a common centre, and m1 = 405 g. If the system is in static equilibrium, what is magnitude of m2, when 

4.1 the pulleys are frictionless, and

4.2 disk 2 exerts a friction of 0.023 N

Answer 1

$$m_1d_1=m_2d_2\\(17)(405)=28m_2\\m_2=246\ g$$