Recent content by Phantoful

Please use the question format that the site tells you to use, it will help you in the end. I'm guessing you are a high school student, so I would suggest ignoring the bridges, because it becomes a topic of civil engineering. Assuming that you would want to find terminal velocity and without...

Same with what Merlin said. My rule is that you can pretty much exclusively use Kelvin in Physics because you can't go wrong with it; differences will be the same and relating things will be much easier, so it's nice to convert straight from the beginning. (Celsius + 273)

According to how you phrased your question, it seems as if your distance shouldn't affect anything; the temperature of your ice cube stays the same, as well as the pressure. Is there any relevant equations your class is going by, or a better context for the question? In your P vs. d graph...

Homework Statement Special Relativity Question. Consider objects 1 and 2 moving in the lab frame; they both start at the origin, and #1 moves with a speed u and #2 moves with a speed v. They both move in straight lines, with an angle θ between their trajectories (again in the lab frame). What...

I don't really believe there are incompatible theories, just different theories with different uncertainties and accuracy. In fact, almost all of Physics is (very close) approximation.

Homework Statement An AFM uses a quadrant photo-diode to measure the deflection of the laser beam. Sketch the voltage in quadrants A, B, C and D as the tip travels on top of a single carbon nano-tube resting on a flat surface when the AFM is operating on tapping mode. Homework Equations Not...

Homework Statement Homework Equations F=ma τ = Iα = rF v=rω, a=rα L = Iω Center of Mass/Moment of intertia equations The Attempt at a Solution [/B] So right now I've tried to model the force acting on the ring as it goes around the peg, but I think centripetal force is involved and I'm not...

Thank you!

Homework Statement Homework Equations Complex number solutions z= z0eαt Energy equations and Q (Quality Factor) The Attempt at a Solution For this question, I followed my book's "general solution" for dampened harmonic motions, where z= z0eαt, and then you can solve for α and eventually...

Homework Statement Homework Equations K = (1/2)mv2 U = mgh W=Fd Integration/Calculus The Attempt at a Solution I'm not sure what I should be doing for this question, if height changes how is it possible that velocity stays the same, according to the conservation of energy (frictionless wire)...

Actually, the question says that the rock leaves with the same velocity it hits with, because it's so small, and conservation of momentum is basically ignored? I don't get how if the rock is moving at the same speed coming off, the car could be moving at all.

1. So for the first rock, I got the equation mrock*u = vc*M + mrock*f, with vc being the speed of the car after getting hit, and f being the speed of the rock after hitting the car elastically. For the first rock, should I be assuming that f is equal to u? I'm not sure if it is, because once the...

Homework Statement Homework Equations p=mv K=(1/2)mv2 Integration and Derivation Methods J=mΔv The Attempt at a Solution So far I set Pbefore=(Δm*u)+(MVcar), with Vcar depending on the time that has passed (I'm not sure how I should find the function for Vcar(t). For Pafter I included the...

I'm not sure how to visualize it this way, but what you're saying is that my equation (inside the integral) should be ((Gσ2πr*m)/Z2)*dr? I used the second equation from #2 in my original post, m being the mass of the point and G being the constant. Why is the equation for circumference instead...

Okay, I'm starting to visualize it now, but I'm not sure how to put it into mathematics. I want to find the gravitational force for each concentric circle that has mass σπ(r2-R2) because V*σ=Msheet, and just using geometry the distance between the mass and the circles would be (r2+Z2)½, here's...