Recent content by adashiu

Homework Statement A vacuum parallel plate capacitor is given. Its plates are of thickness h, width L (in the plane of the figure) and their distance is D. The plates of the capacitor are perpendicular to the plane of the figure, which is at the same time the symmetry plane of the...

Dzien dobry :)) Attachment approval? So you cannot look into it?

Homework Statement 3. The acceleration of a particle is directly proportional to the time t. At t=0, the velocity of a particle = -12 m/s. Knowing that v=0 and x = 15 when t=4s, write the equation of the motion. Here is my solution, could Somebody check it? Text is in Polish, sorry...

I will ask my teacher, what actually this value is, but now I have a pattern how to solve it thanks ;]

Anyway, I had some attempts, probably not correct. I need it for tommorow. Its 1 AM here, so in like about 8 hours I will be kicked out by a professor from room, because I don't have this done

8*109 meaning 872... Thank you for help. Generally i have no idea how to use Doppler's equation twice in this case...

Homework Statement A speeder is pulling directly away and increasing his distance from a police car that is moving at 29 m/s with respect to the ground. The radar gun in the police car emits an electromagnetic wave with a frequency of 8.0x109 Hz. The wave reflects from the speeder\'s car and...

Homework Statement The security alarm on a parked car goes off and produces a frequency of 735 Hz. The speed of sound is 343 m/s. As you drive toward this parked car, pass it, and drive away, you observe the frequency to change by 78.4 Hz. At what speed are you driving? 2. The attempt at...

Iw as trying but no idea at all...

I have no idea... Where can I find that?

Homework Statement What would be the beat frequency if radio waves of wavelength 3.141m and 3.135 are mixed? The Attempt at a Solution I need frequency of wave1 and wave2, because Fb=|f1-f2| But i don't have nothing but wavelength... Any hints?

Homework Statement A 0,824kg mass attached to a vertical spring of a force constant 162N/m oscillates with a maximum speed of 0,372 m/s. Calculate the maximum acceleration of the mass. The Attempt at a Solution amax=vmax*\omega \omega=\sqrt{\frac{k}{m}} Is that correct?

Potential energy is 0?

Yes i know that but there is no formula with velocity... I've got to use mv2/2??

The total energy is 0,5kA2=0,028 But how to express an energy at displacement 1cm? :blushing: