Recent content by matai

yeah I use inertia, but my calc teacher said she wants it in more of math terms so she didn't accept it when i did it with inertia

I have to find the kinetic energy. And have that the mass is 5.9928982144×10^24kg from using the shell method and assuming that the Earth has a constant density of 5514 kg/m^3. So I need to linear speed, to put into the equation KE=1/2mv^2

I need to make an integral to fine the speed of the earth. Say the radius is 6378137 meters. How would I account for things closer to the axis that have a radius of 0.0001 meters? I don't think I can just take the speed at the radius. So I found that the Earth rotates at 6.963448857E-4 revs/min...

So are you saying that I have found the moment of inertia, and that I need to plug in it into the KE formula?

The assignment requires an integral.

So I found the linear velocity by using the circumference of the Earth which I found to be 2pi(637800= 40014155.89meters. Then the time of one full rotation was 1436.97 minutes, which I then converted to 86164.2 seconds. giving me the linear velocity to be 465.0905584 meters/second. I know that...