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Batteries in a flashlight must be held in electrical contact even though the outer plastic housing expands differently than the battery and terminals. This is accomplished by having a compliant spring compressed as the cover is screwed on the flashlight. When the cover is screwed on at room temperature (70oF), the spring, with constant 5lb/in., compresses by 0.25in. The plastic casing has a thermal expansion coefficient of 85(10'6)(oF)1. Let the battery and spring have a single thermal expansion coefficient like that of steel, 6.6(10?6)(?F)?1, and neglect the elastic deformation of the battery.
If the temperature of the flashlight increases to 120oF, does the spring force increase or decrease and by how much? Take the casing wall to have an outer diameter of 1.5 in., thickness 0.125in.,length L = 3 in., and elastic modulus of 300ksi.
A constant head permeability test was conducted on a clean sand sample. The diameter and length of the test specimen were 10 cm and 12 cm respectively.
Calculate the percipitable water (mm) in a 10-km high standard atmoshperic column if the surface conditions are temperature=20 degrees C, pressure=101.3 kPa and the laspe rate is 6.5 degrees C/km.
A $78,000 invtestment in machinery is proposed. It is anticipated that this investment will cause a reduction in net annual operating disbursements fo $16,300 a year for 12 years. The investement will be depreciated for income tax purposes
The ball is kicked so that it has a velocity of 0.5 m/s and the cord is pulled in at a rate of 0.2 m/s. Neglect friction so that the only important force on the ball is the tension in the cord. Find the tension in the cord when the radius is 0.25 ..
A ciricular sewer is laid on a slope of 0.5%. What diameter is required if the concrete pipe is to carry 25 cfs If the desired design mean suction velocity is between 3 and 7 ft/s, is the design acceptable
A 400ft equal-tangent sag vertical curve has its PVC at station 200 + 00 and elevation 250ft. The initial grade is -5.0% and the final grade is +2.5%. Determine the elevation of the lowest point of the curve.
The ½ inch pipe was found to have an average friction factor of 0.0129 and the ¾ pipe had an average friction factor of 0.0209. The length of the pipes between the two manometer connections are 60 inches each.
The engine of an automobile supplies 180 hp at 2500 rpm to the drive shaft. If the maximum shearing stress in the drive shaft must be limited to 6 ksi, determine the minimum diameter required (in inches) for a solid drive shaft.
CE 3303 – Solids – MWF – Spring 2014 - Homework Set 23, – The pipe shaft of the auger, rotating at a constant angular velocity, is subject to the axial force and torque shown. Determine the stress state at points A & B and show on a stress element.
A $325,000 bond has an interest rate of 8.4% but if the bond experiences an inflation rate of 8.6% what will be the profit be after 4 years
The roadway follows the equation (x^2/(60m)^2) + (y^2/ (40m) ^2) = 1 where x and y are in meters. Find the maximum acceleration experienced by the cars. Hint: begin by making a sketch of the ellipse.
If this GCL is used as a liner beneath a 55-ft high landfill with a waste unit weight of 45 lb/ft3, what will be the hydraulic conductivity of the GCL at the bottom of the landfill
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