For Kepler's Laws, see the video "Orbits." Fluids and Thermo are on the "to-do" list, but most likely we're talking March-ish time frame. In the mean time, you can read the tutorials on Fluids and Thermo on the APlusPhysics site under the Courses --> Honors --> Tutorials section! Make it a great day and good luck!
Already did... look for my AP Physics C playlist -- it has the entire AP Physics C mechanics curriculum in there, include moment of inertia (strangle, titled, "AP Physics C: Moment of Inertia"). Static equilibrium comes up in a few places, but you're probably talking about the "AP Physics C: Torque" video. Good luck!
Hey Mr.Fullerton why at 12:00 do you use the g for the entire sphere instead of the g for the enclosed sphere. I am assuming this because you set m(totalsphere)*g = G*m(enc)*m(totalsphere)/ r^2. where m(totalsphere) will cancel and you will be left with Gm(enc)/ r^2 like you had.
Hi Brendan. I'm not sure where that assumption is coming from. I'm finding g (gravitational field strength) at a point inside the solid sphere. Capital G, however, is a constant. If you're talking about the second mass in the equations (not the enclosed mass) -- that's some second "test mass" that doesn't really matter because whatever you choose, it cancels out.
To simplify the problem, I'm assuming it's an infinitely thin hollow shell. A great exercise (and a very commonly assigned problem) is to do the analysis for a shell of some thickness. You might also want to check out Gauss's Law in the E&M unit -- this is really talking about Gauss's Law for Gravity!
You are a great teacher. I was confused about the mass enclosed and uniform mass density of a sphere question in AP physics. But after watching you video i am clear about this now. Thank you
I'm not sure I understand the question, but if you can elaborate, may I recommend posing your question on the APlusPhysics site in the homework help area?
wouldn't you need the radius of interest in the hollow shell as well? the explanation assumes the you move instantly from the inside to the outside. i would assume as long as the hollow is at the centered it can be treated as if it was a solid sphere of lower density.
I have a question : if we have M mass and m mass : which one of the choices that M has large magnitude of Fg force:: ( assume the distance is the same for all d !! M___d____m____d____m or m___d____M____d_____m
Every AP physics tutorial or book just states that the gravitational field inside a hollow sphere is zero. How in the world is this so intuitive it doesn't merit explanation? It makes no sense. If the Earth were hollow and I fell inside through some crack, wouldn't most of the mass be on the opposite side of the world, attracting me? Then I'd end up in the middle, where the force is equal on all sides. How can the field somehow vanish inside a hollow sphere?
For Kepler's Laws, see the video "Orbits." Fluids and Thermo are on the "to-do" list, but most likely we're talking March-ish time frame. In the mean time, you can read the tutorials on Fluids and Thermo on the APlusPhysics site under the Courses --> Honors --> Tutorials section! Make it a great day and good luck!
Already did... look for my AP Physics C playlist -- it has the entire AP Physics C mechanics curriculum in there, include moment of inertia (strangle, titled, "AP Physics C: Moment of Inertia"). Static equilibrium comes up in a few places, but you're probably talking about the "AP Physics C: Torque" video. Good luck!
Hey Mr.Fullerton why at 12:00 do you use the g for the entire sphere instead of the g for the enclosed sphere. I am assuming this because you set m(totalsphere)*g = G*m(enc)*m(totalsphere)/ r^2. where m(totalsphere) will cancel and you will be left with Gm(enc)/ r^2 like you had.
Hi Brendan. I'm not sure where that assumption is coming from. I'm finding g (gravitational field strength) at a point inside the solid sphere. Capital G, however, is a constant. If you're talking about the second mass in the equations (not the enclosed mass) -- that's some second "test mass" that doesn't really matter because whatever you choose, it cancels out.
To simplify the problem, I'm assuming it's an infinitely thin hollow shell. A great exercise (and a very commonly assigned problem) is to do the analysis for a shell of some thickness. You might also want to check out Gauss's Law in the E&M unit -- this is really talking about Gauss's Law for Gravity!
You are a great teacher. I was confused about the mass enclosed and uniform mass density of a sphere question in AP physics. But after watching you video i am clear about this now. Thank you
I'm not sure I understand the question, but if you can elaborate, may I recommend posing your question on the APlusPhysics site in the homework help area?
wouldn't you need the radius of interest in the hollow shell as well? the explanation assumes the you move instantly from the inside to the outside. i would assume as long as the hollow is at the centered it can be treated as if it was a solid sphere of lower density.
Wouldn't the answer be reported as 4x10^22N according to sig fig rules? The mass of Earth and the Sun only contain 1 significant figure.
please do a video on kepler's laws, buoyancy and fluid dynamics, and thermodynamics thanks
Thanks for the kind words, and best of luck in physics! Greetings back from Rochester, NY, USA!
Uploaded just as I'm learning it. Sweet! Very very helpful and impeccably made, keep up the kickass work
can you do one about moment of inertia and static equilibrium
I have a question :
if we have M mass and m mass : which one of the choices that M has large magnitude of Fg force:: ( assume the distance is the same for all d !!
M___d____m____d____m
or
m___d____M____d_____m
Thrilled you think so!
Awesome youtuber, and excelent teacher. I can improve my physics levels, as my english. Greetings from Unicauca at Popayán - Colombia.
Already done. Look for AP Physics 2 - Density and Buoyancy
Every AP physics tutorial or book just states that the gravitational field inside a hollow sphere is zero. How in the world is this so intuitive it doesn't merit explanation? It makes no sense. If the Earth were hollow and I fell inside through some crack, wouldn't most of the mass be on the opposite side of the world, attracting me? Then I'd end up in the middle, where the force is equal on all sides. How can the field somehow vanish inside a hollow sphere?
I believe this video has a good conceptual explanation: ua-cam.com/video/PtpkiS4it88/v-deo.html
Great videos. You make it fun to learn.
Mr Dan can you do something for Archimedes? I mean the main law and the idea extracted from it ? Please cuz It's making me kinda mad !!
Thanks, will keep at it!
Yes!!!!! Exactly!!!!!
Woah! After going through the E&M course, I just realized something, this is basically applying Gauss' Law to Gravitation! That's crazy
Thank you so much :)
+Anne Ge You're welcome!
Jon says hi