Un bloque de masa m se remolca sobre una superficie como lo muestra la figura. El coeficiente de fricción cinética entre el bloque y la superficie es∶ y la tensión en la cuerda es: T. La aceleración del bloque es: a) ⃗ = . B) ⃗ = . C) ⃗ = . + d) ⃗ = .

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.

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

What is a view of science and psychology that says the value of knowledge depends on its usefulness? a. pragmatism b. psychotherapy c. physiology