Recent content by blipped

I got it, or at least I understand the answer now. 80 - (80 - x) gives the remaining distance with regards to x, and this equal to the same measurement given (1/2)(g)t^2. Set them equal and shuffle around a bit. Thanks

Homework Statement A stone of mass 0.2kg is dropped from the top of a building 80m high. After t seconds it has fallen x meters and has a velocity of v. What is the potential energy of the stone t seconds later Homework Equations The answer is 2(80 - x) = 160 - 10t^2 Using suvat: s = ut +...

Thanks for help! I suppose then it's just 55.8 g. The problem stated that there are 55.8 grams or iron per mol, so that's what I put.. I figured out what I'm supposed to do I think.. Just take the cube root of 7.86 x 10^3 kg/m^3 in order to get them to be the same units (ratio of mass to...

Homework Statement What is the volume of one mol of iron where iron is 55.8 g/mol and the density of iron is 7.86 x 10^3 kg/m^3 ? Homework Equations p = m/v The Attempt at a Solution I can get the numerical answer (checked back of book), but I'm not sure how my units worked...

Thought experiment...not really a physics questions though. We see color in relation to the object it is on, like a leaf or dirt, etc... Our brain has the ability to process these colors because our eye is able to take them in. If we bypass the eye and send signals of an image in ultraviolet...

Depends on who is observing and judging this.

Found these looking around for stuff about nuclear reactors (Clipped from the Abstract) - This is interesting http://www.iop.org/EJ/abstract/1063-7869/46/7/A05" Progress in particle accelerator technology makes it possible to use a proton accelerator to produce energy and to destroy...

Here is an interesting article on parakeets vision and how they use it http://www.lisashea.com/petinfo/articles/bird_sight.html" A weird question.. I know that we can use equipment to see in infrared, but the image just uses our perceptible spectrum to give an image of what that would look...

Alright, things make a bit more sense now. Thanks everyone. I'll do a bit more research on the nature of light as well.

Don't take my word, I'm not the sharpest knife in the drawer, but wouldn't the only case where all three are conserved is in an environment where there is no friction?

Thanks for the reply, a bit of a follow-up example. Say you have two lasers, blue and red, and you shoot them from point A to point B. They will both get there at the same time, but doesn't the blue light (because it is a higher frequency - more peaks) have to travel a longer distance than...

I've been looking around with google and I understand WHAT frequency is but I don't understand how it really works with light. For example, looking at a star if we are moving from it (or it's moving from us, or both) the light is red-shifted, but if we're moving towards it then it's...