Question

Rotational motion

3) A horizontal circular platform can rotate around a vertical axis at its center with negligible friction. You decide to use the rotating platform to design a procedure that will allow you to determine the unknown rotational inertias of different objects, for example a bowl. You know the rotational inertia of the platform Ip. Which of the following procedures would serve your task? Comment on why. (More than one answer could be correct). Comment on the procedures that are not suitable and explain what is wrong with them (a) Exert a constant toque τ on the empty platform and measure its angular acceleration ar. Then place the bowl on the platform and repeat the previous experiment, obtaining apB Calculate the rotational inertia of the bowl using the expression石 PB (b) Perform the same experiment as in (a) but use the expression 1,-4( -1) PB (C) Spin the empty platform and measure its angular velocity ω、while the platform is rotating place the bowl carefully on the platform at its center. Wait until the bowl rotates together with the platform. Measure the final angular velocity of the bowl-platform system aCalculate the rotational inertia of the bowl using the expressionI (d) Perform the same experiment as in (c) but use the expression I,-4( 2-1) (e) Measure the mass of the platform mp, the mass of the bowl m, the radius of the platform rp and the radius of the bowl Calculate the rotational inertia of the bowl using the expression /p1 a

Answer 1

brae Z IS xerte bowl From ana oKpol PAPR thul PB

ulo montur "Thul eoYTUt_ express, on 0 2. as koe TT Roth podeon and hool aTe rot '"สุ won expre ion