PLZ Help! When a sample of 114.97 g NH4NO3 dissolves in 47.07 g of water, the temperature changes from 28.4 C to 7.9 C. Calculate the heat flow (Q) with respect to the water in calories.

i don,t know so just answer mine

gas

explanation:

smoke is the matter of a gas

i think tornado but not 100%

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.