PLZ HELP ASAP: A baseball has a moment of inertia of 9.56 × 1877 kg•m2 and a mass of 56.78 × 1824 kg. Based on these values, what is the ball's radius?

Question

iwanttogotostanford · Answer

@zepdrix @YoungStudier

iwanttogotostanford · Answer

@.cheesecake.

iwanttogotostanford · Answer

@jacobciezki @calculusxy

baru · Answer

moment of inertia of a sphere = $\frac{2}{5}MR^2$

iwanttogotostanford · Answer

@baru i used that formula, but i got a really strange number..

iwanttogotostanford · Answer

@imqwerty

iwanttogotostanford · Answer

i know i use I=mr^2 but I'm having trouble doing the math....

iwanttogotostanford · Answer

so far i have: 9.74X1037=5.98X1024r^2

imqwerty · Answer

okay 
so we have this-
$\large 9.74 \times 10^{37} = \frac{2}{5} \times 5.98 \times 10^{24} \times R^2$

oh okay are we allowed to use calculator?

iwanttogotostanford · Answer

yes

imqwerty · Answer

after simplifying i got this-
$4.07 \times 10^{13} = R^2$ 
$\sqrt{(4.07 \times 10^{13}) }=R$
$R=6.37 \times 10^6$ meters

iwanttogotostanford · Answer

is that the simplified answer??? @imqwerty