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The device shown is used in the semiconductor industry to polish silicon wafers. The wafers are placed on the faces of the carriers. The outer and inner rings are then rotated causing the wafers to mo
A simply supported square timber beam is span 5.0m and spaced 3.0m the dead load and imposed load was found to 1.5knM2 respectively.
A rectangular beam made using concrete with f'c = 6000 psi and steel with fy=60000 psi has a width b= 20 in. The concrete modulus of rupture fr=530 psi.
What do you understand by the term durability? Compared to other considerations, how much importance should be given to durability in the design and construction of concrete structures?
A hawk flying at 2 m/s at an altitude of 45 m accidentally drops its prey. The parabolic trajectory of the falling prey is described by the equation below until it hits the ground, where y is its heig
A three-span continuous H20 timber beam with three equal spans of 1.3 mts supports a uniform load of 22.46 KN/m^2 with intensity q = 20.214 KN/m.
A segment of urban four-lane (two lanes in each direction) has a 3% upgrade that is 1500 ft long followed by a 1000-ft 4% upgrade. It has 12ft lanes and 3ft shoulders.
A highway reconstruction project is being undertaken to reduce crash rates. The reconstruction involves a major realignment of the highway such that a 60 mi/h design speed is attained.
A mechanic uses a crowfoot wrench to loosen a bolt at C. The mechanic holds the socket wrench handle at points A and B and applies forces at these points.
The casting has a mass of 3 Mg. Suspended in a vertical position and initially at rest, it is given an upward speed of V mm/s in 0.3s using a crane hook H.
The inclined leg differential manometer as shown in Figure 1 below shows a reading along the inclined leg mercury manometer of 50mm. Determine the pressure difference between A and B.
A car travelling at 60 mph in a construction area skids into a stack of concrete barriers. Skid marks leading to the crash measures 150 ft. The car was travelling on a 3% upgrade on a pavement with fr
Given bulk density as 1300kg/cubic meter and field capacity as 22% by weight and permanent wilting point as 10% by weight calculate available water capacity.
A vertical curve is formed when a rural highway passes under a bridge joining a -8% grade to the horizontal grade satisfying the requirement for safe speed of 90 Km/hr . Determine the minimum cl
The fixture AC is designed with a screw adjustment to regulate the height of the 900 N load supported by the roller at A. The screw bears against a smooth surface at B. Determine the reaction fo
A 1: 1.8: 4.5 mix has a water/cement ratio of 0.6 and a cement content of 300 kg/m3. The temperature of the ingredients are as follows: cement 180C, aggregate:300C, water:20 0C.Assuming that the
The voltage for registering a bit of 1 on Ethernet can be as low as 2.5 volts or event 1 volt.why is this so low when the capacity for transmitting electricity on the copper wire is so high.
Describe the difference between population standard deviation and sample standard deviation. Describe a scenario in which you would use each.Other than the calculation of statistics, how could an
Lets design the members if they are made of wood(compression and tension design strength = 5000psi) or aluminum (???compression and tension design strength= 20000psi). Do not use any safety factor
Four laboratory-scale, continuous-flow, completely mixed activated sludge reactors have been operated using wastewater from a yeast production plant. The data found are shown in Table below. Det
following results were obtained from direct shear tests on specimens of a sand compacted to the in-situ density.determine the values of the shear strength parameters c' and o'.normal stress is 5
16.5 The California ambient air quality standard for visibility requires that the average σ e be less than 0.23 km - 1 when the relative humidity is less than 70%. To what visual range doe
Determine the AADT for the axle counts; 28,000 axles have been counted in a year and 10% trucks are measured.
A 1kg ball is dropped from the top of a cliff and falls with a constant acceleration due to gravity. Assume that effects of air resistance can be ignored.
Identical bricks 0.1m wide, and weighting 2kg are placed on a plate (assume the plate has neligible weight). Calculate the total weight (and force F required to balance the plate).