Two vectors, in three dimensions, are given in cartesian coordinates as :
a=(8,8,9)
and
r=(4,9,5)

using these vectors, determine the angle between these two vectors in radians

Asquare 1m x 1m plate is shown below. all four of its edges are kept at 0 co. at t=0the temperature distribution is given by: y xtsins n75)=.a) using separation of variables determine the temperature distribution t(x,y,t)along the plate at any time t.b) discretize the heat conduction equation +=22222 txtusing a second-order centered difference scheme for the two second derivatives and a first-order forward euler scheme for the first derivative. using von neumann stability analysis, determine the stability criterion for the proposed discretization scheme in terms of , hand t. solve for the maximum allowable time step tmax

What electron configurations do atoms usually achieve by sharing electrons to form covalent bonds?

What causes an electric current in a wire?