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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 (70?F), the spring, with constant 5lb/in., compresses by 0.25in. The plastic casing has a thermal expansion coefficient of 85(10?6)(?F)?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 120?F, 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.
vehicles begin to arrive at a toll booth at 850 am with an arrival rate of xt 4.1 .01t with t in min and xt in veh
A falling-head permeability test is being conducted on a saturated sample of clayey silt having hydraulic conductivity of 6.5 x 10-9 m/s. The diameter and the length of the sample are 100 mm and 150 mm.
A hollow rectangular steel beam is 18 cm deep by 10 cm wide, outside dimensions. The walls are 2 cm in thickness. From the shear and moment diagram, the maximum vertical shear on the section is 180 kN
Select the best rectangular HSS for a column to support a service dead load of 30 kips and a service live load of 90 kips. The member is 22 feet long and is pinned at the ends.
A worker slowly moves a 50-kg crate to the left along a loading dock by applying a force P at corner B as shown. Knowing that the crate starts to tip at about the edge E of the loading dock when a= 200mm, determine:
As the weather forecasters frequently state, the atmospheric pressure drops during stormy weather and it rises during clear and sunny days.
Characteristics between Pre-historic and Egyptian architecture and Egyptian and west Asiatic Architecture
Often times, this pressure comes from the fact that community's water supply is stored in an elevated reservoir. Determine how high an elevated reservoir must be so that the water supply has a pressure of 50 psi. Given: the unit weight of water is..
A flowrate of 3.5 ft^3/s is to be maintained in a horizontal aluminum pipe ( E = 5 * 10 ^-6 ft). The inlet and outlet pressures are 65 psi and 30 psi, respectively, and the pipe length is 500ft. Determine the diameter of the pipe.
The driver of the vehicle does not look for oncoming traffic. Road conditions and vehicle speeds on the highway are such that it takes 1.5 seconds for an oncoming vehicle to stop once breaks are applied.
The buses are run by independent drivers, however, who make no attempt to coordinate their schedules. Actually, one bus runs slightly faster than the other so that over many trips the fraction of trips that the second bus leaves within a time t
A glass is cleaned in 45 0C hot water and placed onthe table bottom up. The room air at 20 0C thatwas trapped in the glass gets heated up to 40 0C andsome of it leaks out so the net resulting pressure inside is 2 kPaabove ambient pressure of 101 kPa...
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