- #1
Sneakatone
- 318
- 0
a)I used the equation KE=1/2Iw^2
I=mR^2 ---> 1.5x10^30*20000^2
w=2.1*2pi
KE=1/2(1.5x10^30*20000^2)(2.1*2pi)^2=5.2x10^40 J
t=2.1 rev/s / 1.4x10^-15 rev/s^2=1.5x10^15 seconds
5.2x10^40 J/1.5*10^15 seconds =3.4x10^25 watts
B)1.15*10^15 s=1.1*10^18 years
I feel like this method is correct.
I=mR^2 ---> 1.5x10^30*20000^2
w=2.1*2pi
KE=1/2(1.5x10^30*20000^2)(2.1*2pi)^2=5.2x10^40 J
t=2.1 rev/s / 1.4x10^-15 rev/s^2=1.5x10^15 seconds
5.2x10^40 J/1.5*10^15 seconds =3.4x10^25 watts
B)1.15*10^15 s=1.1*10^18 years
I feel like this method is correct.