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1.Helium(15 degrees Celsius, 1atm) will be transported in a straight horizontal copper tube over a distance of 150 m at a rate of 0.1 m^3/s. If the pressure drop in the tube should exceed 6 in h20, what is the minimum pipe diameter? ( first classify the problem as case 1, 2 , or 3)
2.The electrical power supplied to the motor is 90 kW. The motor in turn delivers 100 hp at a speed of 1000 rpm to a hoist arrangement for an elevator. Define the electric motor as the system and calculate the rate of work for the system.
3.A low consumption solar refrigerator uses 12-v d.c. battery for the supply of 60 W of electrical power to the motor that drives the compressor of the refrigeration device. What is the current supplied to the motor?
4.A 45 W electric mixer is operated for 5 minutes while mixing a 2 kg shake. Assume Csubv=4200 J/kg-K for the liquid. Determine the temperature rise (in degrees C) of the milk shake.
Data obtained from aerial photography showed six vehicles on a 600 ft long section of road. Traffic data collected at the same time indicated an average time headway of 4 sec. Determine the (a) density on the highway (b) flow on the road (c) space me..
Photovoltaic array, Under insolation conditions of 500 W/m^2 (direct sunlight), and 10% solar cell efficiency
An industrial building has floor area of 5 m by 8 m and is 3 m high with a door 1 m wide and 2 m high. Leakage of transformer oil from a pump occurs and is ignited. What is the maximum area of spill in (m^2) if flashover is to be avoided.
Axis of the hole is perpendicular to VP. Draw elevation, plan and development of the lateral surfaces of the pyramid.
a) Calculate Darcy's velocity of the groundowater as well as the amount of water that passes through the aquifer each day. b) for the same aquifer, determine the seepage velocity of water through aquifer if the effective porosity is 32%.
Compare the effectiveness of the zinc coating with a typical epoxy coating on reinforcement. How does the epoxy coating protect reinforcement and what happens if the coating is nicked.
A saturated soil has a unit weight of 120 pcf and a water content of 32.5%. Determine the void ratio and specific gravity of the soil.
A small plot of land has measured dimesnions of 50 by 150 ft. the incertianity in the 50-ft is +/- 0.01 ft. Calculate the uncertianity eith which the 150-ft must be measred to ensure that the total uncertainty is not greater than 150%.
A notched beam, machined from AISI 1020 steel is subjected to reversed bending. Determine the endurance limit Se. Assume the survival rate of 99.9 percent and Cs = 0.75 and that the fatigue stress concentration factor is Kf =2.5.
Estimate the amount of Ca(OH)2(s) leached from concrete during a one-year period by precipitation. Assume that the area receives 40 in/yr of precipitation which is in equilibrium with
A 1.20-m thick strata of sand has a void ratio of 1.81. A contractor passes a vibratory roller over this extra strata, which densifies it and reduces its void ratio to 1.23. Compute its new thickness.
A certain gas has a molecular mass of 40. It is under a pressure of 2.5atm and a temperatature of 25 Degree Celsius. Determine its density and pressure in CGS absolute units.
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