Recent content by Phystud

It that the correct answer? If anyone has any input on this! Greatly appreciated.

I forgot to multiply 1/2 to 17.82 which equals to 8.91 I then: 4.725x10^4 divide by 8.91 and get the anwser and square root it and my answer would be w=72.82 rad/s. How about now? I believe I have found my mistake.

If you could just verify this for me id greatly appreciate it, even tho I am thankful already for all your help. 1st KE=1/2(7.4008)(113)^2=4.725x10^4 2nd KE=1/2 Iw^2 4.725x10^4=1/2(17.82)w^2 w=51.5 rad/s I really hope I did this right! And thank you sooo much for your help.

Or can I just use the spheres value and solve for rotational kinetic energy and then solve for angular speed since I have the kinetic energy now?

So do I just use the disk answer and plug in like this: KE=1/2 x 17.82 x (113rad/s)^2. But, this will get me the rot. kinetic energy and not how fast its rotating!?

I believe i made a mistake, i need to first convert centimeters into meters! Its 7.4008 for the ball and for the disk: 17.82

Aha, my book says KE, but ill check with my instructor. So far I have solved for the inertia for the ball and disk: ball:74008 and disk:178200. How do I approach the next step? Do I add both inertias and solve for KE(Ek)?

So it is not KE=Iw^2, I am looking at it in my book and it says this one!

KErot=1/2 ω⋅LC=1/2 ICω2 i found this one on this site for kinetic energy. Ball: I=2m(r(squared))/5 Disk: i=m(r(squared))/2

I believe so. An object can speed up or slow down in a rotational manner, it's linked with mass(inertia). I also know that it depends on the mass of the object, the point of rotation, and its shape.

How fast a disk is rotating? Please help me Im trying to attempt this problem, its not a assigned homework problem but it has 2 stars beside it(which means its one of the harder ones) in the book so I am trying to solve it but i don't even know how to begin and have a crack at it. I really...