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Water flows on the inside of a steel pipe with an inner diameter of 2.5cm. The wall thickness is 2mm, and the convection coefficient on the inside is 500 W/m2oC. The convection coefficient on the outside is 12 W/m2oC. Calculate the overall heat transfer coefficient, U and comment on what is the most significant determining factor for U. If the pipe is covered with a layer of asbestos (k=0.18 W/moC) while still surrounded by a convection coefficient with h=12 W/m2oC, what is the critical insulation radius? Will the heat transfer increase or decrease by adding a layer of asbestos insulation with a thickness of a) 0.5 mm, b) 10 mm?
A plunger applies pressure to the water. If, with zero force, the initial length of the water column is 25.00 in, what will it's length be if a force of 420lbs is applied to the plunger. Assume no leakage and no friction.
Data obtained from aerial photography showed six vehicles on 900 ft-long section of road. Traffic data collected at the same time indicated an average time headway of 4.3 sec. Determine (a) The density on the highway. (b) The flow on the road, and
Labor of this activity is given as in the CREW, 1 brick mason and 1 helper. The productivity is 0.5 labor hours per 1 sf. The wages are for the mason $60 and for the helper $45 per hour.
At a section in a beam the tensile stress due to bending is 70 N/mm2 and there is a shear stress of 25 N/mm2. Determine from first principles, the magnitude and direction of the principal stresses
The top of the object is 1 m below the surface of the fluid. What are the magnitude and direction of the hydrostatic force acting on the top of the object.
The effective angle of friction (phi) was found to be 26 degrees for a normally consolidated soil. If the soil is tested in consolidated drained triaxial test under sigma3 = 60 kPa, what would be the failure deviatoric stress sigma1-sigma3 stress
At what temperature does the liquid solidify? What is the composition of this last remaining liquid phase?
A concrete dam retaining water has a specific weight of concrete of 23.5kn/m3, what is the factor of safety against sliding & overturning and pressure intensity on the base if coefficient of friction is 0.45
You are to assume that seawater at 77oF will be used in the tank and the curved portion forms a quarter of a circle. The tank is open to the atmosphere. The overall height, h2, is 20ft deep. The radius of the curve, R, is 5ft. The width of the..
The yield stress for A-36 is 250 MPa. Using factor of safety against yield of 1.25, determine an appropriately sized beam such that the radius of curvature is not less than 140m. E= 200 GPa, G= 77.2 GPa.
Assume that the width of the intersection in 24 ft and the car is 20 ft long. If the driver's perception-reaction time is 0.75 seconds, determine if he can clear the intersection safely for the following conditions
The discharge of the river at the basin outlet is measured at an avarage of 650 cfs. assuming that the charge in storage for the system is essentially zero, estimate the ET losses for the area in inches and centimeters for the year
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