Fluid flows over a smooth cylinder. the diameter of the cylinder is d and the length normal to the flow direction is l. the drag coefficient is defined as:
cd⁢ = fdrag / 1/2⁢ rho⁢ u^2⁢ d⁢ l
the drag coefficient is essentially constant with a value of 1.1 in the range of reynolds numbers of 10^3 to 10^5. in this range, at a velocity of 2 m/s the drag force is 3 n. when the velocity is doubled to 4 m/s the drag force is

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w