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A person (mass of 80g) is lifted upward by a 2 cm diameter safety rope with constant velocity. What is the tensile stress in the rope?
A one-way solid concrete slab is to be used for a simple span of 16 ft. In addition to its own weight, the slab carries a superimposed dead load of 50 psf and a live load of 75 psf.
A 600 MWe power plant has an efficiency of 36% with 15% of the waste heat being released to the atmosphere as stack heat and the other 85% taken away in the cooling water.
Wastewater enters and anerobic pond at a BOD of 246 mg/L and a flowrate of 0.1 m^3/s. The waste degrades at a rate of 0.40d. Effluent from the lagoon must have a BOD of 23.9mg/L.
Ball A is thrown vertically upward from the top of a 20-{\rm m}-high-building with an initial velocity of 3m/s . At the same instant another ball B is thrown upward from the ground with an initial velocity of 16m/s .
What is the runoff coefficient in a basin located near the middle of the climatic spectrum, with annual precipitation P = 32 in, ecosystem evapotranspiration ET = 22 in, and baseflow U = 3 in
How far apart must two 18 m diameter tanks be placed such that their stress overlap is not greater than 10% of the contact stress at depths of 10, 20, and 30 m
A 0.20 kg stone attached to a 0.8 m long string is rotated in a horizontal plane. The string makes an angle of 25° with the horizontal. Determine the speed of the stone.
Describe the problem of lack of coordination between design and construction in a traditional contract. In agency CM,what expertise does the CM provide during the pre-design and design phase.
The length of the wire is 7,000 m, the weight density of the steel is 78 kN/m3 and its ultimate stress is 620 MPa. Find the safety factor of the wire against breaking from its own weight.
A force is specified by the vector F= 120i-160j+80k lb. Calculate the angles made by F with the positive x-,y-, and z- axes.
Determine the drag force FD on a golf ball assuming it is a smooth sphere. (Assume the air is at 60 F and standard pressure.) Now determine the drag force on an actual golf ball assuming CD = 0.25. How do the two forces compare
The forces F1, F2, and F3, all of which act on point A of the bracket, arespecified in three different ways. Determine the x and y scalar components of each of the three forces.
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