Can't Touch This!

Nowadays as technology increases, our dependency seems to be straying away from gas and moving towards batteries, electronics, and outlets. Yet the idea of electric seems to correlate with voltage. While Electrical forces equals F= kQq/r^2, and fields equals E = f/q = kQ/r^2, voltage is another animal. Voltage is a ratio of potential energy over the charge. so one volt is equivalent to 1 joule of energy over 1 coulomb. Though sometimes you can see voltage as a huge number, it can be harmless depending on the ratio. A Coulomb itself is large, but for example, the Van De Graff generator pumps out 400,000 volts yet contains only a fraction of a Coulomb. (Hence it is why i am still alive today). Remember, just like speed, voltage is a ratio, which it is not necessarily the number you see. But if the Van De Graff generator DID have 1 Coulomb, I'm sorry to say, but you wouldn't see me here today. In this picture, I am showing a wall outlet, as an example of something with great voltage, enough to kill you, make you faint, or paralyze you. Can't touch that!

Torque and Moment of Intertia!

Here we can see torque in another great perspective. The equation for torque as we know is T=rf. R being the distance from axis to force, and f representing force. But another way we can look at the door handle is as I, moment of inertia. According to 11.6, a door handle like this one (solid cylinder with axis running along the center) is represented by I= .5MR^2. This amazing equation only requires you to know the radius and the mass. Once you have that, we have a masterpiece! By the way, just for reference, moment of inertia is "the measure of resistance to angular acceleration."