The diffusion coefficients for a maxwellian field star distribution depend on the functions g(x) and erf(x)- g(x), where g(x) is defined by equation (7.93) and x = v/(v20). show that g(x lim x0 x erf(x lim x-0 2 2 (7.218) 3/t x thus show that as the velocity of the subject star v + 0, the diffusion coefficients of equation (7.92) satisfy d[(avj|)2] = d[(av1)2]. explain physically why this must be so.

Which branches of natural science include the study of an organism that lived 10 million years ago

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c.m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?

How is the acceleration of an object in uniform circular motion constant? a - in magnitude only b - in direction only c - in both magnitude and direction d - in magnitude, direction & orientation