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When working with flow through pipes , engineers typically have to determine if the flow is laminar or turbulent. Compute the Reynolds number for each of the cases below and determine if the flow is laminar or turbulent. Assume all of the conduits are smooth.
a. Air at 20 C is traveling at 3.5 m/s through a small 2-mm tube.
b. SAE-10W oil at 100 F is pumped through a 6-inch diameter pipe at 1.75ft/s.
c. Water at 20 C is sent through a small pipette of 1-mm diameter at2.5 m/s.
a layer of clay, 5m thick, overlies a deposite of sand, 5m thick, which is underlaid by rock. the water table in the sand is sub-artesian with a level at 2m below fround level. the saturated unit weights of the clay and sand are 21 and 16 KN/m^3 r..
A 10-mm diameter bar of 1040 carbon steel is subjected to a tensile load of 50,000 N, taking it beyond its yield point. Calculate the elastic recovery (or strain) that would occur upon removal of the tensile load.
What superelevation rate would you recommend for a roadway with a design speed of 100 km/hr and a radius of curvature of 500 m? Assume f = 0.11.
The number of hours on each machine required to produce a product is given in the following table, along with the number of hours available per week on each type of machine. Assume that the company can sell everything it produces.
The barrel has an inner diameter of 4ft. Neglect its wall thickness. Assume that only the hoops resist the water pressure. Note: Water develops pressure in the barrel according to Pascal's Law, p=62.4 lb/ft^2, where z is the depth from the surface..
HOCL is added to water in a tank as a disinfectant. after equilibrium is reached it is found that the pH of the water in the tank is 8.2 and the gas phase partial pressure is the head space of the tank is 0.2E-7 atm. (not: henry's law constant for..
A sample of 20 yields a mean 32.4. Test the two sided hypothesis that the sample drawn from a population with a mean of 35 for the following cases. (a) if a variance of the population is 33; and (b) if the variance of the population is unknown,
a horizontal curve on a single-lane highway has its PC at station 124 + 10 and its PI at station 131 + 40. The curve has a superelvation of 0.06 ft/ft and is designed for 70 mi/h. What is the station of the PT?
The coefficient of friction between the crate and the floor is µs = 0.4 and µk = 0.3. If P is slowly increased until the crate starts to move and then remains constant, determine using energy methods the speed of the crate after moving 2 m.
Given the following data for a vertical curve of a road; G1=-2.5%, G2=+5.5% and station of PVI=250+50.At station 252+50, the vertical curve must intersect an existing road at elevation 48.48ft. the elevation on the tangent section at station 256+5..
Water flows over a dam. Assume the volume flowrate per unit length q along the dam is a function of the head h , width b, acceleration of gravity g, f luid density and the fluid viscosity. Determine a complete set of dimensionless parameters
If a mechanical device requires 450J of work to do 310J of work in lifting what is the efficiency of the device?
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