Nitrogen has a melting point of -210.0°c and a boiling point of -195.8°c. a sample of nitrogen is heated from -215.0°c to -200.0°c. which of the following best describes what happens to the nitrogen atoms during this transition? a. they lose enough energy to be held in a permanent location. b. the attractive forces between them decrease, allowing the atoms to move relative to one another. c. they gain enough energy to move relative to one another. d. they gain so much energy that the attractive forces between them have no effect on their motion.

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