Question

I’m confused on the simplest part, which is what to multiply the 2/5 by to get it to the other side...please help

Answer 1

Mass, M = 4.859 Kg

Step-by-step explanation:

Given the following data;

Radius, r = 0.225 m

Moment of inertia, I = 0.123 kgm²

To find the mass;

Mathematically, the moment of inertia is given by the formula;

I = ⅖Mr²

Making M the subject of formula, we have;

Cross-multiplying, we have;

2I = Mr²

`M = \frac {2I}{r^(2)}`

Substituting into the formula, we have;

`M = \frac {2*0.123}{0.225^(2)}`

`M = \frac {0.246}{0.050625}`

Mass, M = 4.859 Kg