A 4.0 kg mass is hung from a string which is wrapped around a cylindrical pulley (a cylindrical shell), as shown in Figure 8-7. If the mass…

28) A 4.0 kg mass is hung from a string which is wrapped around a cylindrical pulley (a cylindrical shell), as shown in Figure 8-7. If the mass accelerates downward at 4.90 m/s2, what is the mass of the pulley?