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...Physics problem set solution i what is the moment of inertia a propeller with three blades treated as rods mass cm m length l at relative to each other ii if torque acts on this how long will it take reach an angular velocity iii many revolutions have made before reaching iv get numerical answers kg n rad s answer we know not look p that single rod rotating around its end ml hard convince oneself there are them same axis and in plane just times since t icm from our knowledge constant acceleration problems number consider for rectangle sides along y b x about two symmetry axes rotate one these think composed show parallel ma going back very denition spun through perpendicular area be nswer nd ix dividing into thin has should obvious sum contributions simply e was but let more explicit divide up where large so they really though doesn matter then contributing being asexpected logic course applies xrmi notice picture r can write easy see kind argument work any object you choose your block...