# Don't know integrals so much

1. Nov 27, 2006

### PMP

What is the integral of:

$$dt= \frac{dr}{\sqrt{2\frac{GM}{r}+ 2C}}$$​

where C is a constant?

I need to integrate this, but I don't know integrals so much. Thanks

2. Nov 27, 2006

### StatusX

For simplicity, reduce your questions to general ones with as few constants as possible. (you can plug in whatever the specific constants are later). Are you asking how to compute:

$$\int \frac{dx}{\sqrt{1+a/x}}$$?

If so, try the substitution [itex]u=\sqrt{1+a/x}[/tex].

3. Nov 27, 2006

### PMP

Yes, I am asking that integral. Thank you!!!