Recent content by f3nr15

Fantastic, just what I needed for upcoming exams.

The derivations from both my study-guide and my teacher say: 0.5mv2 + (-GMm/r) = 0 0.5mv2 - GMm/r = 0 0.5mv2 = GMm/r mv2 = 2GMm/r v2 = 2GM/r v = √(2GM/r) Otherwise I can't calculate the escape velocity any other way. The Physics curriculum from which we learn from has been extremely...

High School Physics textbooks say the escape velocity is v = √(2GM/r), the highest level of Maths in High School Physics is simple trigonometry (sinθ & cosθ only), fractions (Fc=mv2/r), substitution and quadratics and definitely NO calculus (a=Δv/Δt instead e.g Final Velocity - Initial...

I'm being confused between a Physics past exam paper book and a Physics study guide. Is the escape velocity derived from EK + EP = 0 (this makes the escape velocity depend on the mass of the body to escape from i.e. Earth or a planet) or EK = EP (this makes the escape velocity depend on the...

Because E = hf says the energy of the emitted photons from the WiFi is of a safe 10-54eV ?

i think heat energy is rapid kinetic energy. if you touch a boiling hot kettle the rapid vibrations of heat from the kettle's atomic structure will vibrate your finger causing it to split, depending on the amount of time. my very primitive theory on heat.

What we found: The graph is not a straight line which shows that the nichrome wire does not obey Ohm's Law, that is, it is non-ohmic.

What are capacitors in detail ? I don't get how two plates that aren't in contact are able to store high voltages.

1) Methods/equipment for radioactivity detection. For my high-school Chemistry studies, needs clarification. Geiger counter: A small chamber contains a high voltage electric field inside filled with inert gas. When ionizing particles/radiation enters the chamber, it will ionise the...

I saw one that looked like a sine curve I mean, each time it completed a 900 period (clarify my wave terminology) it would go to the z-axis which is the magnetic field. Another 900 later it would go back to the y-axis which is the electric field. And because it was a sine curve, as x was...

My bad ... but I can't edit my thread !

On a EMR graph, there's a graph with a x, y & z axis (for the magnetic field perpendicular to the electric field) ... It's apparently a sine curve, but as soon as the value of x goes past 180 degrees it immediately goes onto the z axis becoming a magnetic field then an electric field once the...

Oh OK so microwaves have a separate magnetic flux.

Preserving the lifetime of a bulb ? My father claims that is is better do leave a light bulb on rather than switch it on or off when used often because he says, "Electric charges are very fast and damages the filament inside with each flick of the switch closing the circuit, even more damage...

I was bored so I make fun with derivations of SI units of many Physics formulas. Note, this should just be called "introductory physics", that means NO calculus (but rate of change designated by the delta symbol) and motion is in one or two directions only. This is high school physics level in...