Air (k equals 0.032 space W divided by m K comma space P r equals 0.7 ) at 320 oC flows across 4.5-cm-diameter tubes whose surface temperature is 55 oC with a Reynolds number of 8000. The Churchill and Bernstein convective heat transfer correlation for the average Nusselt number in this situation is N u equals fraction numerator 0.62 R e to the power of 0.5 end exponent P r to the power of 0.33 end exponent over denominator open square brackets 1 plus open parentheses 0.4 divided by P r close parentheses to the power of 0.67 end exponent close square brackets to the power of 0.25 end exponent end fraction The average heat flux in kW/m^2 in this case is

Athin plate moves between two parallel, horizontal, stationary flat surfaces at a constant velocity of v = 7.5 m/s. the two stationary surfaces are spaced 4 cm apart, and the medium between them is filled with oil whose viscosity is 0.9 n·s/m2. the part of the plate immersed in oil at any given time is 2 m long and 0.5 m wide. if the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. what would your response be if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top surface (h1)? if the plate moves through the mid-plane between the surfaces, the force required to maintain the motion will be n. if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top (h1) surface, the force required to maintain the motion would be n.

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

Two solutions of the same uv-absorbing molecule were analyzed by uv-vis spectroscopy on the same instrument using 1 cm pathlength cells. use data from the table to calculate by what percentage the concentration of solution b is compared to that of solution a.sample absorbance at 315nm a 0.45 b 0.80