Recent content by sollinton

Kind of a silly question here, but one that has nagged at me for some time: Does the word "light" refer to all wavelengths of the electromagnetic spectrum, or only to the visible light that we can see? Also, if light only refers to visible electromagnetic radiation, then what about ultraviolet...

Homework Statement Light from the sun arrives at the earth, an average of 1.5*1011 m away, at the rate of 1.4*103 W⁄m2 of area perpendicular to the direction of the light. Assume that sunlight is monochromatic with a frequency of 5.0*1014 Hz. (a) How many photons fall per second on...

Hello everyone. First off let me apologize in advance if a question similar to this one has been answered already. I searched around the forums, and I've done some research outside of PF, but I haven't quite found what I'm looking for. I am about to enter my sophomore year of college, and I...

Homework Statement "A Daredevil plans to bungee-jump from a hot-air balloon 65.0 m above a carnival midway. He will use a uniform elastic cord, tied to a harness around his body, to stop his fall at a point 10.0 m above the ground. Model his body as a particle and the cord as having...

Aww come on guys that's not very nice. Chris probably confused the number of laps a particle can make around the LHC with the number of laps a particle moving at almost the speed of light can make around the Earth. And obviously he's not well versed in the concept of time, which is...

Anyone who has a TI-83 or 84 calculator will probably know about the normalcdf(minimum, maximum, mean, std. deviation) command. It is used to find the area under a normal curve between two given points. My question is; does anyone know the equation that the calculator uses to find this...

Okay, so using your equation R = R_{o} + c(\Delta T) I solved for c c = \frac{(R - Ro)}{\Delta T} c = \frac{(10.55 \Omega - 10 \Omega)}{70 C} And found c to equal 0.0078 \frac{\Omega}{C} Then plugging c back into the original equation and using the new \DeltaT: R =...

Homework Statement "A metal wire has a resistance of 10 ohms at a temperature of 20 degrees C. If the same wire has a resistance of 10.55 ohms at 90 degrees C, what is the resistance of this same wire when its temperature is -20 degrees C?" Homework Equations I am not exactly having...

I'm pretty sure we're talking about Black Holes forming from clouds of gas, not from Supernovas...

Alright, now I'm not a pro with physics or anything (I'm only a senior in high school), but would I be right in generally comparing your answer with skipping a stone? As in, if I throw the stone at a more glancing angle, it will more readily "bounce" off the surface of the water than it would...

First off, let me apologize if this is in the wrong section, but I was not entirely sure what branch the answer would fall under. Okay, my question is this (and its probably pretty obvious): If water is clear, what makes it an almost perfect mirror when you look across a still lake? My...

I know this isn't exactly a homework question, and it may be in the wrong section, but I've looked all over the forums and could not find a better place for it, so I apologize if this is in the wrong section. I'm looking into buying a new calculator for my AP Physics class this fall and found...

Homework Statement I don't particularly need help with anyone problem, I just need a refresher on how to find the Key Point and Asymptote of an equation like the following: f(x)=2^(x+2)+3 Y-Int=? Key Point=? Asymptote=? Homework Equations I'm pretty sure I'll only need the...

Thanks a lot, this really helps. :smile:

Sorry for the dumb question but... My friend and I were wondering how much energy is given off by an average black hole relative to its mass. (like X black hole gives off Y% of its mass as energy per second) Thanks in advance for your help.