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An uncovered swimming pool loses 1 inch of water off its 1,000ft^2 surface each week due to evaporation. the heat of vaporization for water at the pool temperature is 1,050 Btu/lb. the cost of energy to heat the pool is $10.00 per million Btu. a salesman claims that a $500 pool cover that reduces evaporizative losses by two-thirds will pay for itself in one 15-week swimming season. can it be true?
A 1 cm diameter, 0.4 m long steel rod is to be used in an application where it will be subjected to an axial tensile force of 15kN. The factor of safety based on yield stress must be at least 1.5, and the axial deformation must not exceed 2 cm.
Given the following information, determine the required DO concentration in the treatment plant effluent discharge in order to ensure that at no point downstream the DO in the river drops below 4 mg/L:
Describe with the aid of diagrams explaining why and when boundary layer separation occurs. c)Describe some methods to prevent boundary layer separation
The pins on the frame at B and C each have a diameter of 0.25 in. If these pins are subjected to double shear, determine the average shear stress in each pin.
A single-scoop ice cream cone is a composite body made from a single scoop of ice cream placed into a cone. Assume that the scoop of ice cream is a sphere with radius = 3.36cm that is placed into a 9.90cm tall cone.
A 10 feet thick clay that was unsaturated with a unit weight of 108 pcf and a water content of 20% gets saturated and also swells by 20% due to rain. G=2.70.
effect of acidic water on strength of soil used to store the water. the reduction in strength at various acidic ph
Given the data below for two alternatives, find the better alternative, if MARR is 8%. alt A |alt B Initial cost $10,000 |$15,000 maintenance cost/ year $1,000 |$500
Lines of levels were run requiring n instrument setups. If the rod reading for each backsight and foresight has a standard deviation δ what is the standard deviation in each of the following level lines?
A significant obstacle in the design of atomic weapons is theso-called delta phase instability (a type of mixed dislocation) inPu-239. This is the problem: We wish to construct a sphericalatomic bomb core out of pure delta phase (f.c.c.) Pu-239. A de..
You meet with a potential client to discuss a land development project. Your client wants to know the capacity (in cfs) of the existing water supply system serving the area With a 450-ft pipeline
A 500 lb flywheel is shown. A 100 lb block is held by a light cable wrapped around the hub of the flywheel the radius of which is 2 ft. If the system is released from rest and the weight has a velocity of 11 ft/sec after 5 s
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