Question

Please explain the higlighted values

Example 5 The flywheel shown in Fig 121, has a rim with a 750 mm outside diameter and 100 mm square in section The hub is a hollow cylinder of 200 mm outside diameter, 1000 mm bore and 150 mm long The six arms, each of cross-section 30 cm", are to be considered as thin rods The wheel is made up of cast iron (density 7,2 x 10 kg/m) Calculate the moment of inertia and radius of gyration of the wheel about its axis Figure 1.21

Answer 1

100 06 6x300 Jinsth ot fam - 375-100-100 l00 175 mm 0.15 Cal cutat the mass eG all the dicrent Part Rim MRVolume x density ニ 01N010-65×7-2* 14 19 A Rm MA Volume x よnsity of each arm 30Cm- 3x10m C1SSectonal ata total cossectid asa dc Veew membes ot ams x 0ssec Honal area ob each am 18 xi3 m Gx3x1 total crokctonal area o ams X Lnsth 06arm volum Issix (35-10-l00) 16 18 x ix o175 3-15 x 163 m3 315x163 x 2 x1Ra68 K mA St8