Recent content by alex_rodin

Homework Statement There is a brownian particle in 3D space and absorbing sphere with radius a. At moment t = 0 the particle was situated at distance l from the sphere. Caluclate the probability of absorbing the particle by the sphere. Homework Equations n is probability densithy for the...

You are right. The second distance is 20m = (14m + 3m) + 3m.

No. The answer is 6m and 14m for first and second images.

Draw the mirrors and imaginary images S1' and S2' of the women in each of the mirrors. Also draw an imaginary image of the imaginary image in the other mirror. So you can calculate the distances between the woman and the imaginary imaginary images.

Thanks. This is a pure interest. :)

There is all correct in your solution. The d\theta is not goes from the expression for the tiny mass element. It goes out after integrating: \int\limits_{\frac \pi 2 - \alpha}^{\frac \pi 2 + \alpha} \sigma R^2 \sin \theta d\theta = \left . -\sigma R^2 \cos \theta \right |_{\frac \pi 2 -...

Is it possible to deduce the expression for momentum using only Einstein postulates in 3D?