Reescribe la ecuación de Fourier de modo que quede Q en función de t. Q(t) Ayúdenme xfa:( ni entendí a que se refiere

Like a key in a lock, the shape of the. must bind with the. of the recieving neuron

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

Explain why electric current cannot exist if a current doesn't have a voltage source.