Recent content by hvthvt

I guess that is the accelerated motion along the x-axis: Vox= Vo * cos45 and x=Vox*t However, I do not know the time it takes. From ma= eE + mg I am able to calculate the acceleration. I can calculate Ymax by stating that Vy=0 when the particle reaches its maximum distance. And we know that Vy...

Homework Statement In the figure, a uniform, upward-pointing electric field E of magnitude 2.00×103 N/C has been set up between two horizontal plates by charging the lower plate positively and the upper plate negatively. The plates have length L = 4 cm and separation d. Electrons are shot...

Well, then I would say.. Wcharging=∫\frac{q}{C}dq=\frac{1}{2} Q^2:C =0.5QV2=0.5CV2 ? I don't see how I can integrate it with the current varying..

O, I am very sorry. I forgot to include the circuit itself. Here it is! So, I think that the graph starts from V=72V for t=0 This is the moment when the lamp starts flashing and the capacitor starts discharging, right? and it reaches zero in a couple of seconds? So from left to right it...

Homework Statement The figure shows the circuit of a flashing lamp.There is a current through the lamp (see the photo) only when the potential difference across it reaches the breakdown voltage VL; the capacitance DIScharges completely through the lamp. (a)A lamp has breakdown voltage...

Oooooh, I understand it, actually it looks pretty simple? So that's the answer to b. Now for (c) I have to solve it.. meaning m*(dv/dt) + kv = - mg dv/dt + kv:m = -g I do not really understand what to do with the initial velocity. This is zero. ektv = - g*k*ekt + c so v= -k*g +...

Homework Statement A very simple question, but I can't figure it out. An ideal diatomic gas, with rotation but no oscillation, undergoes an adiabatic compression. Its initial pressure and volume are 1.20 atm and 0.200 m^3. Its final pressure is 3.60 atm. How much work is done by the gas...

Ok, at this point I'm pretty confused and stuck, especially because this is just part (b).. (dv/dt) + (k/m)*v = g ??

The standard form of this diff equation should be (dv/dt) + ((-6η∏R)/m)*v = g p(t) = -6η∏R/m so P(t)=-6η∏Rt/m So the integration factor is e-6η∏Rt/m This gives (e-6η∏Rt/mv)' = g*e-6η∏Rt/m e-6η∏Rt/m*v = (mg/-6η∏Rt)*e-6η∏Rt/m Is this correct..

Hey tiny-tim and Chestermiller, thanks for motivating. I think that: F=mg + 6η∏Rv F=ma , so mg + 6η∏Rv = m*(dv/dt) I know that there is a v in the drag force, m*(dv/dt) - 6η∏Rv = mg Is this the differential equation? Further calculus gives (dv/dt) - ((6η∏R)/m)*v = g Now I should determine the...

Homework Statement A spherical stone of mass 0.500 kg and radius 10 cm is launched vertically from ground level with an initial speed of 20.0 m/2. As it moves upwards, it experiences drag from the air as approximated by Stokes drag, F=6η∏Rv, where the viscosity of air is 1.002 mPa*s...

Homework Statement A small box of mass m1 is sitting on a board of mass m2 and length L. The board rests on a frictionless horizontal surface. The coefficient of static friction between the board and the box is, as usual, less than μs. The board is pulled with a force F, as shown. We wish...

Hmm. I do not understand how I can give the fraction for the volumes. Can anybody show this idea to me? Please?

How can I show that the net horizontal force is ρVω2R? F=ma= and a = ω^2r but how can I show that it is 2R? And can anybody help me with the explanations for questions d and e ?

Homework Statement A cubical block of density ρb with sides lengths L floats in a liquid of greater density ρL. (A) what fraction of the blocks volume is above the surface of the liquid? (b) the liquid is denser than water (density ρw) and does not mix with it. If water is poured on the...