Recent content by godingly

Hey, I have been searching the web, and have some unanswered questions regarding waves: 1) I understand that you measure a sound wave's wavelength between two crests / areas of maximum compressions. Why do these compression areas occur? I thought the wave just moves on until it fades out. 2)...

Homework Statement I read about Joule's experiment proving the transformation of mechanical work into heat. But say I have a bowl with some water, and I start turning a spoon in it very fast, thus doing work - the water won't get hotter! What am I missing? Homework Equations conservation of...

For example, in glycolysis, NAD+ is reduced to NADH and then it's more energetic. Why adding electrons to an atom gives it more energy?

Absolutely. There's only one way to do math these days - and that's rigorously. If you'll study math, many of your first courses (including Calculus) will begin with this (rigorous introduction to number theory), and work their way up to more advanced topics. There's an answer book somewhere, it...

Hey, I know I'm wrong, but I don't know where. I've read several textbooks and searched the web, I would appreciate if you could explain my mistake: When two atoms collide with each other, they would do work on each other. By the second law of thermodynamics, some of this work would turn to...

Thank you, I understand the formula of the 1st law, but I don't understand : 1) In the case of work, the ideal gas law states PV=nRt. since n & R are constant, and T rises, that means Pressure increases by more than Volume decreases. But Boyle's law states that V and P change inversely...

1) I don't completely understands Charles Law (V = T*k) - This implies that if we increase the volume of an object, it's temperature will rise! Imagine a piston-apparatus - If we push the piston up, and increase the volume of the gas, why would its average kinetic energy rise? What would make...

Thank you all for the answers! For mfb and alephzero - is there a formula to calculate the perpendicular (normal) distance from a point on a tangent line to the circle? When I say normal, I mean 90 degrees at the tangent line, not at the circle.

Hey Dear forum, I know I'm wrong, but I don't know why: Since the Earth's descends 5 meters for every 8km, a horizontal speed of 8km/sec will put an object to rotate around the Earth (neglecting air resistance). I.e. in one second it will fall 5m below it's initial height, but so will the...

Dear forum, while standing, spreading your legs helps your stability because you have a wider base. but doesn't spreading your legs lowers your center of gravity, thus shortening the distance (r) from your center of gravity to the ground, and therefore lowering your moment of inertia = making...

I thought that unless an opposing force has acted on the box, the net force on the box will continue to be 6 Newtons, and therefore the box will continue to accelerate. But, the force is instantaneous, and "evaporates" immediately. no textbook tells you that about the nature of force. Got it...

Thank you, Doc Al. I will restate my question: Assuming I give the box a push, and stay in my place (or drift to the opposite side, according to the third law) : Is the force I gave to the box is ever-present, or is it instantaneous? if at t=0, f=6, what is f at t=0.5, or t=1? if it's zero...

Homework Statement Thanks for looking. My understanding of Newton's Second Law, F=MA, is: If I give some mass a force, it will accelerate at some rate. Imagine an infinite, frictionless surface. If I give a box of 1kg a push of 6 Newtons, it will accelerate at 6 m/sec2. So, at t=0, v=0. at...