Question Number 23759 by k Student last updated on 05/Nov/17
Commented by k Student last updated on 05/Nov/17
$${please}\:{solve}\:{it} \\ $$
Commented by ajfour last updated on 05/Nov/17
Commented by ajfour last updated on 05/Nov/17
$$\:{I}_{{cm}} ={m}_{\mathrm{1}} {r}_{\mathrm{1}} ^{\mathrm{2}} +{m}_{\mathrm{2}} {r}_{\mathrm{2}} ^{\mathrm{2}} \\ $$$$\:\:={m}_{\mathrm{1}} \left(\frac{{m}_{\mathrm{2}} {r}}{{m}_{\mathrm{1}} +{m}_{\mathrm{2}} }\right)^{\mathrm{2}} +{m}_{\mathrm{2}} \left(\frac{{m}_{\mathrm{1}} {r}}{{m}_{\mathrm{1}} +{m}_{\mathrm{2}} }\right)^{\mathrm{2}} \\ $$$$\:\:=\:\frac{{m}_{\mathrm{1}} {m}_{\mathrm{2}} {r}^{\mathrm{2}} }{\left({m}_{\mathrm{1}} +{m}_{\mathrm{2}} \right)}\:\:\:\:\:\:{option}\:\left(\mathrm{1}\right). \\ $$