Recent content by drnikitin

You can get it from the second Newton's law F=m*dv/dt According to Work(W)-Energy(E) theorem we have the definition of kinetic energy dE=dW=F*dx=F*v*dt=m*v*dv=d(m*v^2/2) From which we get the kinetic energy E = m*v^2/2 Hope this helps Prof. Nikitin, My Quick Online Physics...

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The net force is F=2*9.8+0.3*9.8=22.54 N. The net mass is m=2+1=3kg. So the acceleration is a=F/m = 22.54/3=7.5 m/s^2. Thus your answer is correct

Find forces (magnitude and direction) from each of the three charges on the fourth charge from Coulomb's law. Then add these forces taking into account their directions

The intensity of scattered light is inversely proportional to wavelength to fourth power. Thus the blue light, which has the smallest wavelength, is more easily scattered, and as the result the passing light looks reddish

It is called the Gauss' theorem

You are right. The minimum thickness of the coating is given by t=[lamb]/4n. I think you did an error in calculations. Check it please.