the pressure inside a container of gas increases if more gas is added to the container because
a. there is an increase in the number of particles striking an area of the wall of the container per unit of time.
b. there is an increase in the temperature.
c. there is a decrease in volume.
d. there is an increase in the force of each collision between a particle and the walls of the container.

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answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.