# Free Calculus Help

Browse below for our collection of online calculus resources, some from FreeMathHelp.com, and others as links to other great math sites. There are also several free online calculators that you may find VERY useful in solving those tricky calculus problems, or for checking your answers.

## Recent Calculus Questions

Freefall time including angular momentum Monday November 12, 2018
So the freefall time onto a point mass of mass M is: t = (d^3/2GM)^1/2 , what is the freefall time including angular momentum p = mvd, where, with constant m, v = 1/d if angular momentum is to be

Integration of gravitational force on a test particle in a uniform density disk Monday November 12, 2018
So imagine a disk of radius "R" with a point "p" at arbitrary distance "r" from the center. I'm going to describe three regimes within this disk as follows: 1. The area within the disk described by

find s(x)=1/x+4/x^2+9/x^3+16/x^4+... (x>1). Monday November 12, 2018
Someone told me to take derivative on both sides to get s(x) but I do not know how to do it. I figured out 1/x+2/x^2+3/x^3+4/x^4+...=x/(x-1)^2, (x>1) by breaking up every

Finding a domain Monday November 12, 2018
I don't understand how to start. Also, I'm experiencing a problem in general when doing calc where it makes sense when someone explains an issue for me, but I don't know how I would do it myself if

Series Question: Divergence or Converence? Sunday November 11, 2018
Hello! New member here! I just have a quick question on a problem I have. Attachment 10475 (https://www.freemathhelp.com/forum/attachment.php?attachmentid=10475) For this problem, I used the