Thursday
December 5, 2013

# Posts by Charlie

Total # Posts: 355

physics
Would someone check my thinking please. A solid sphere (mass, r, and moment of inertia given) is rotating at a given angular speed. Friction is constantly applied at the 'equator' of the sphere, and brings it to rest in 3s. Find the force. I worked out the torque, and ...

Physics/Maths
Thanks

Physics/Maths
Keplers third law I understand. T^2/a^3 of one planet = T^2/a^3 second planet. But I can't do the algebra to solve for the second planet's a^3 (semimajor axis) Would someone walk me through the steps please? Thanks.

Entropy
Thanks for that.

Entropy
If a sample of an ideal gas is heated at a constant volume, I believe its entropy will increase. Am I right? Thanks.

Physics capacitance
Thank you very much.

Physics capacitance
I know that to solve: f=1 over 2 pi sqrt LC for C, I have to use C= 1 over L(2 pi f)^2 Can someone take me through the rearranging please. Thanks.

Thermodynamics
Thank you for giving such a detailed answer.

Thermodynamics
Would someone explain entropy in simple terms please. Thanks.