Question Number 219190 by fantastic last updated on 20/Apr/25
Commented by AntonCWX8 last updated on 21/Apr/25
$${Youtube}\:{has}\:{a}\:{lot}\:{of}\:{videos}\:{explaining}\:{this}. \\ $$$${Search}\:{it}\:{yourself}. \\ $$
Answered by Marzuk last updated on 20/Apr/25
$${Rotating}\:{disk}\:{problem}.{One}\:{of}\:{the}\:{hardest} \\ $$$${exam}\:{questions}\:{in}\:{the}\:{world}. \\ $$
Answered by mr W last updated on 21/Apr/25
$$\left({A}\right) \\ $$$$\omega_{\mathrm{1}} ={angular}\:{speed}\:{of}\:{rotation} \\ $$$$\:\:\:\:\:\:\:\:\:{about}\:{z}−{axis} \\ $$$$\omega_{\mathrm{1}} \sqrt{{l}^{\mathrm{2}} +{a}^{\mathrm{2}} }=\omega{a} \\ $$$$\omega_{\mathrm{1}} \sqrt{\mathrm{24}{a}^{\mathrm{2}} +{a}^{\mathrm{2}} }=\omega{a} \\ $$$$\mathrm{5}\omega_{\mathrm{1}} =\omega \\ $$$$\omega_{\mathrm{1}} =\frac{\omega}{\mathrm{5}} \\ $$$$\Rightarrow{true} \\ $$$$...... \\ $$