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Three identical charges, each at 3 x 10^-6 C are arranged at the vertices of an equilateral triangle with one side of the triangle being 30cm. How much force is there on any one of these charges at any time?

If there is a specific equation to use for this problem please show it.

A box with fragile cargo is rolled down a ramp with rollers (no friction). If the downward component of the box's velocity is more than 2.5m/s the cargo will break. The ramp is 1m high and inclined at some angle to the horizontal, what is the steepest angle that can be made that will allow the cargo to arrive intact?

Please explain your answers.

I have an original DS, the bulky, silver kind. My house's WiFi is WPA meaning it can't connect directly to the router. I looked around for a DS Wifi adapter but most stores don't seem to have these and the few I found online were ridiculously expensive. I did find a few third party ones, but they were advertised as DS Lite adapters. Is this an irrelevant difference, and if so will I be able to use it with my DS original?

Solve (-27)^n=9 for n

And 4(16^1/3)=2^n for n

Help is greatly appreciated