Recent content by Physics-Tutor

Velocity can also be negative...

You are correct in your definition: Electrical Potential difference between two points is the work required to move a unit charge from one point to the other. Now, work (seen from the charge) can be positive (external actor does the work on the charge, i.e. gives the energy) or negative (the...

ehild is correct: k is the spring constant, m the mass. These two are constant, so the angular velocity is constant.

It is favorable because in this reaction energy is released: this release of energy comes from the fact that the binding energy per nucleon increases from reactants (U) to products (Ba + Kr).

Linear velocity will change during the oscillation (x changes) so the KE will too:

mfb is absolutely correct, what moves around are electrons (negatively charged). I can conceive that upon contact, some electrons move from the sphere to the non-conducting rod, but not much though, and the potential of the non-conducting rod remains positive, even though it is now a little less...

The differences you find are due to your choices of significant figures. 1st, be consistent. if you want 3 sf, use 9.81 m/s2 for g and include the mass of the bullet in your first step (mass of block + mass of bullet = 1.429 Kg) . 2nd, use an extra significant figure for intermediary results...

1st part (Conservation of momentum): OK 2nd part: Using conservation of energy would be a more straightforward approach... However if you still wish to use kinematics, try another equation that does not involve time. The one I am thinking of will give you the same expression than if you used...

Although, this is probably not what is asked from you in the exercise you mention, you are correct. A soap bubble film has a similar construction similar to your problem: low n (air) / High n (soap) / Low n (air). As you may suspect, the iridescent colors of a bubble are due to thin film...

Thank you ProfuselyQuarky, I'll definitely check it out... :-) Could be a less painful than typing the equation in word, capturing pictures and posting them in my posts!

Well you know that the maximum static friction force on an object before it starts moving is μsN (with N=mg). And it is also the centripetal force, an expression of which contains ω. By equating these two, you should be able to find the maximum angular velocity at which the rubber can stay on...

NEW Ooooh, I really like this one... gives me the shivers :-)!

when studying the different areas in Physics, have you ever wondered why waves, cycles and oscillations appear to dominate our universe, from the distribution of matter in the CMB down to description of particles, and even further down for some (string theory). And it's not all, how come we, as...

HI Amy, Ray is correct. All depends on the error you are willing to consider It might be relevant to neglect the Rel. effect or not depending on what you are trying to achieve. For example, you can calculate the fraction of the speed of light for which you have to take into account...

I agree with Vela, where does this 0.5 come from? The question is: what is the value of n for which a fringe due to (λ1) will coincide with that a fringe of λ2). The first occurrence will occur when one of the wavelength has created an extra fringe compared to the other... (So a difference in...