Recent content by kuenmao

You forgot that the car itself isn't an inertial reference frame. This is an accelerating reference frame we're talking about. To compensate for the frame change, we have to add a force on every object inside the frame, pointing in the opposite direction to the movement of the reference frame...

Omin probably meant to say "no net force/no unbalanced force" rather than "no force at all".

no object is absolutely rigid as a consequence of special relativity. From an outsider's point of view, the blade would still be moving at a speed even nearer to the speed of light, when compared to the speed of the "section nearest to the pivot point". There is no such "strongest" material...

In the second question, the first thing you need to know is the formula for electromagnetic force(which you already do: F=qv x B. So, to find the force, you need to know the charge, the velocity and the strength of the B-field. The strength of the B-field is given: 0.250 T. Then you need to...

This is a wrong concept. Whether the wall moves or not only decides how long you are in contact with the wall, and how long your hand can hit it. Also, even when the wall breaks, you still get hurt, if you punched hard. The same thing is that when you get a soccer ball very hard, even if it...

I suspect that this belongs to the homework help zone. How hard is that? Think of the direction of the electromagnetic force with respect to the particle's motion.

Another reason for me to suggest people to read SR and GR thoroughly before coming here to start pointless arguments. You should really need to work out the reference frames first, one by one. I just don't get why people keep twisting and mixing up concepts, and then coming to completely...

The ball goes left and right due to the initial speed. Gravity keeps it in a circular orbit. Suppose we have a spaceship. When the spaceship takes off, the rockets do work and push it into orbit, giving it an initial speed. Then, suppose that the spaceship throws out a satellite. The satellite...

Sounds like homework to me O_O...wrong section. A hint is to look up Hookes law.

You neglected the fact that there are so many air particles(All kinds of mloecules) so that the "air particles" you mentioned would be in a medium of similar density. It's like pouring water into water; water does not sink through water like matter with high densities. It's just that air has a...

One suggestion is to make a box, and then within it put a mass fixed with weak springs, which would allow the piece of mass to move whenever the system was put in an accelerating reference frame. Obviously, the system is a few orders off in terms of precision and magnitude, but the same thing...

Actually...I was meaning to ask if anybody(or any organization) ever did such precise experiments in space to see if things not acted upon by an external force would suddenly start accelerating... :rolleyes: ... Or perhaps it would be better to say whether or not things would suddenly...

If the universe is defined as "all that there is", then what would be the meaning of saying "outside the universe"? Instead, I'd like to ask a question...is the universe, as a whole, taking an average, an accelerating reference frame? Do we experience accelerations even though we do not produce...

*edit* Didn't read what ZapperZ wrote, so it's somewhat similar to what he said. I agree with the what some others have said about physics: Nothing is wasted, if you pursue a career related to physics, or require any of it. But I think that for common people, taking physics isn't meant to know...

I figured that since the bonding of elements is involved, this should be regarded as chemistry...but honestly, I am not sure which forum this should go. Anyway, my question is simple: Can anyone eplain the bonding and anti-bonding in MO theory to me? My textbook mentioned that the bonding...