Could somebody confirm my answer about angular momentum and inertia?

Question

Q4 Estimate (order of magnitude only) the magnitude of the angular momentum of the Earth due to its daily rotation on its axis. The Earth may be assumed to be a uniform sphere of mass 6*10^24 kg and radius 6*10^3 km. The moment of inertia of a uniform solid sphere of mass M and radius R is 2/5 M R^2 Choose the option that is closest to your answer

and pencil across one cell in row 4.

KEY FOR Q4

A) 10^28 kg m^2 s^-1

B) 10^30 kg m^2 s^-1

C) 10^32 kg m^2 s^-1

D) 10^34 kg m^2 s^-1

E) 10^36 kg m^2 s^-1

I think the answer is A

Answer 1

You might be taken a little more seriously if you would remove the extraneous content when you did the copy and paste.

Ignoring that, to find the angular momentum, use

L=I w

where

L=angular momentum

I=rotational inertia

w=angular speed

To find w use

w=2 pi/T

where T=period=1 day=24 hours

(actually about 4 minutes less than that, but that doesn't matter)

You must convert hours to seconds

1 hour=60 minutes=(60)(60 seconds)

You already have a detailed description on how to find the rotational inertia.

Just plug in the values and you'll have your answer.