Recent content by Periapsis

i guess, I = ∫ r2d(m) could work

How can you get the moment of inertia if you don't have the radius of the ball? 2/5mr^2

okkayy, i totally understand that! thank you so much!

add the two masses up.

if you arent solving for torque, why is the length of the arm necessary?

Well, for part A, you pretty much solved it already. Just plug in the 9.5m/s for Δω, and .38s for Δt. For part B, remember that F=ma. You calculuated the angular acceleration, and you are given mass, once again, just plug it all in.

what about engineering major, with many physics classes, then some sort of graduate program

apsidal precession is cool too!

Talk about geostational orbits and tidal locking

I think i would understand this a lot better if I had a much better understanding of integrals. In high school AP calculus, we are just learning the product and quotient rule of derivatives, I just read ahead and try and scrounge the internet for more information

What sort of careers exist for physics majors? And what sort of graduate programs should i be concerned with?

I absolutely agree, I understand that. But what would a physics degree offer, engineering aside.

ohhh okay, so we take the differential of Volume? because we are splitting the sphere up into tiny spheres with near-zero volume? And since density stays constant, its simply with respect to volume?

@Hallsoflvy why are you saying mass equals the integral of density over volume? ρ = m/V. rearranged, m = ρV.

It does, i think you just answered my ultimate question. How does substitution work in any integral/derivative? so you can substitute mass with ρdV, simply because mass = ρv? why do you say its with respect to volume and not density? Same with velocity as a derivative of position. d/dx s(t) = v...