Question

Calculate the angular momentum of the disc whose rotational KE is 10 kJ and moment of inertia is 4.5× 10*-4kg m*2

Answer 1

where,ω= angular velocity=?I= moment of Inertia= 8*10⁴now,from given data,1000 = ½(8*10⁴)ω²or, ω= ½ rad.s-¹

now, angular momentum,

L = Iω

or, L= (8*10⁴)*½

or, L= 4*10⁴ Kgm²s-¹ (Ans.)