It means that 19.3g of gold is packed into 1cm^3.
<span>A star is born as a main sequence star when the temperature of the star's core becomes high enough to fuse hydrogen into helium. ... The story is different in evolved stars like giant stars. Once hydrogen in the core of the star is exhausted, the energy generation becomes small and the core starts to collapse. Hope this helps.</span>
Answer:
Explanation:
Moment of inertia of bar and one ball attached at its one end
= 3.8 x .8² / 12 + 2.5 x .4² ( MI of bar = m l² / 12 and sphere = m r² )
= .20267 + .4
I = .60267 kg m²
Net force acting on the rod which will try to rotate will be weight of 2.5 kg ball . Because it was this force which was balancing the whole system. Torque due to this force = mg x r
= 2.5 x 9.8 x .4 Nm
= 9.8 Nm
angular acceleration = torque / moment of inertia
= 9.8 / .60267
= 16.26 rad / s²
b ) This angular acceleration will change because torque will change ( decrease in fact ) . It is to be noted that maximum value of torque acts when force is perpendicular . Since torque decreases , angular acceleration decreases.