Recent content by Mazerakham

Well, you've got A x B = 0, so this equation means that either F_a = dp/dt OR[inclusive] dr = 0. I don't get it. F_a - dp/dt is always zero, so I don't know what significance the dr has. You confused me too, with the abbreviation "exp" which often means exponentiate. But honestly, that's...

Scientists use other instruments to measure quantities besides the human eye, you know! How do you think doctors read x-rays? With super-powers? No, a machine does it for them, then creates an image for the doctor to see. The image is a visible light representation of the x-rays

Sorry. Thank you Nabeshin. I'm just a classical physics kind of guy, haven't really dabbled in this relativity stuff. Thanks. But I thought someone in your thread was saying that, if gravity waves propagate at c, then there would be some sort of torque on the earth?

I would have added this post to the other thread on Gravity, but I thought this was too theoretical of a segway, so it needed its own thread. But, if gravity fields transmit instantaneously, then wouldn't it be a way of transmitting information faster than light? (Say, a sort of gravity...

Why do we think that the Big Bang contained "all" the matter/energy in the universe? If we imagine the point, the "big bang point" to be some accumulation of mass, what makes us think that it should have "waited" for all the mass in the universe to accumulate in it before exploding? That's...

Good reasoning. And intuitively, I would agree. But why, then, do we theorize about a "beginning" to the universe. If it is intuitively obvious that the dimensions of space extend infinitely in every direction, then shouldn't time also extend infinitely? It makes no more sense to me that...

Does the universe have a boundary--i.e. if we could go out "sufficiently far" in some direction, would we eventually hit some barrier preventing us from going further? Theories anyone?

I'm going to feed this debate, and maybe provide a stronger argument to counter your religious acquaintance. Consider the moon of Saturn, Enceladus (don't know it-- Wikipedia it. It was in a recent Scientific American). It is clearly very far from the sun. It is much smaller than the...

No. Changing the pulley system is kind of like changing the incline of the road or the weight of the car. You wouldn't argue that by changing the pulley system, we have changed the anatomy of the boy and his arm? No. It's the same boy. Similarly, changing the incline of the road, or even...

First of all, Lsos, I'm actually saying that in ALL situations, the driver presses the pedal "to the metal," so we're talking about the engine operating at full power. Okay Paulo, as soon as you understand this, I think you'll be good. I am not claiming that the engine is "thinking" or...

Okay it's a good problem. The answer is correct, so let's make sense of the solution, since you're confused. This reasoning is correct. WHAAAAT?? No! This problem assumes a resistance is "the same" in both situations. It MUST be referring to force of friction F. If the force of...

Hold the phone, you're misinterpreting the equation. Now, by the way, I know NOTHING about thermodynamics, I'm waiting for a book to come in, so I can read up on it. But, according to your equation (and this is the first time I saw it) dG = dH - TdS, it seems that if dS is positive...

Well, none as far as I can think of, but I'm sure there are other situations where resistance is proportional to speed (perhaps raised to some power). I know that mass changes with speed at speeds near the speed of light, that's easy to look up on wikipedia if you're interested, I think. You...

Yep. Liked the last post, btw. And yea, you know you've reached the "speed limit" when the sum of the forces equals zero. I just presented an example problem which encapsulates all of this, which is on the thread (also made my pConstantino) "What's the use of power" The only difference...

Okay, I will create a problem, and present its solution: Suppose Constantino is capable of riding his bike at 15 meters/second against a constant friction force (no air resistance) of 20 Newtons of force. How fast would Constantino be able to ride his bike if an air resistance constant of k...