Recent content by Greatness

Which relationships are you referring to? Also, why in E = mc^2 is m sometimes referred to as either relativistic mass ( in the context of light? ), while at other times (and what I understand) as rest mass?

Pardon my elementary questions, but: Why is it that photons can only travel at the speed of light? I know because they have zero rest-mass it is only possible for them to travel at c, but is there some mathematical reasoning to this through the mass and momentum equivalence equation...

Ahh okay. So energy released, like kinetic energy, can compensate for the loss of mass during the bond. But, since the formula for kinetic energy is Ke = mv^2, how do you know mass is lost/gained, changing the value of Ke, but not the velocity? Just by looking at the equation, it seems to me...

jtbell: When in a chemical reaction is mass lost? If two elements form a molecule in a ionic bond, one electron being transferred will result in less mass then a free electron, but if that electron becomes free of that bond, will it gain mass and therefore energy? When you say "reactant," what...

I understand what nuclear binding energy is and its importance in nuclear weaponry an the fueling of stars, but why, in other types of bonds, such as chemical bonds, Einstein's equation e=mc2 is not applied and the bonding of two substances is not assumed to have energy as mass? But when an...

Alright, thanks, I forgot about that. Why does the new nucleus have a smaller rest energy, is it due to the mass defect? Why does the mass defect occur, do we even know?

Alright, but unfortunately I'm still confused with the use of "binding energy". When you say that the fused nuclei have more binding energy, does this mean that they require more energy to be separated into their nucleons? It seems very counterintuitive to me. Are the energies of the first...

So, the energy released by fusion is due to the mass defect... When there is less mass associated to the energy of the nucleus or atom, as per E=mc^2, then the extra energy is released... Am I correct?

I read that nuclear binding energy is the energy required to separate a nucleus into its comprising nucleons. Why then is mass defect calculated from this? How is the nuclear binding energy graph used to calculate energy released from fusion? Please explain in layman's terms, if you could...

Hmm. In the initial problem, the mass of the steel ball mentioned in the initial problem is invalid. The mass is one if the answer is 40m/s with given info. https://www.physicsforums.com/showthread.php?t=659382 Either way, the work is done.

Never mind. I solved it by not replacing ma with 0 but by dividing by m first and replacing v with v^2. In these types of problems, when is v or v^2 used?

None of that information is needed. The initial question is that it is dropped from a large height. The only information given is the information proveded (v and a).

Homework Statement This is a repost of a homework like question. The previous thread I did not understand. In the assumption that drag is proportional to velocity, and when v = 20 m/s, a = 7.35 m/s^2, find the terminal velocity. Homework Equations The thread stated that the equation most...

So, one of Newton's Laws of Motion is -F(sub)1 = F(sub)2. Gravity is (generally) pulling us down with an acceleration of -9.8 m/s^2 where negative is downwards. Because of the above law, it has been said that this is felt upwards in objects. Why do I only feel gravity downwards?

I have been studying momentum and began believing that I understood it, but I began thinking... Between two objects of the same mass, the first object will collide with another object (let's say the second object is not moving) and the momentum, in an isolated system, will be transferred...