Question

Two spheres are each rotating at an angular speed of 24.6 rad/s about axes that pass through their centers. Each has a radius of 0.400 m and a mass of 1.68 kg. However, as the figure shows, one is solid and the other is a thin-walled spherical shell. Suddenly, a net external torque due to friction (magnitude = 0.330 N · m) begins to act on each sphere and slows the motion down. How long does it take (a) the solid sphere and (b) the thin-walled sphere to come to a halt?

Solid sphere Thin-walled spherical shell

Answer 1

Tosque = IL D Torque = 0.330 Nm. - x=3 Isolid=2/5 MR² - solida. 0.330 XS XT.GQX 6.42 & solid=3.07 red 15 tsolid = wf-w1 8.0l see x solid - tshell coft-wia - Sshell <sell = 1 er helt = 0.3 1.68x0. UP) t=13.36 sec