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The loaded trailer has a mass of 900 kg with center of mass at G and is attached at A to a rear-bumper hitch. If the car and trailer reach a velocity of 60km/h on a level road in a distance of from rest with constant acceleration, compute the vertical component of the force supported by the hitch at A. Neglect the small friction force exerted on the relatively light wheels.
How many pounds of coal must be burned to keep one 100 watt light bulb lit for one hour? Assume efficiency of the power plant is 35%, the transmission losses are 10% fo the delivered poer, and the heating value of coal is 12,000 BTU/lb
Colette Lake has a surface area of 103 ha and a mean depth of 8 m. The pH of the water is 7.6. The lake receives surface water from a lake upstream, rainfall, and diffuse groundwater input. Atmospheric inorganic N deposition is insignificant.
Geometric design and construction of a new two-lane two-way road has been recently completed and now it is time for design pavement near Ballarat, Victoria.
If for parathion, the activation energy is 15.4 kcal/mole and A = 8.1 x 109 at a pH = 7.8, how many days will the fish hatchery have to contain the river water if T = 15 oC (winter time)
A polutry farm owns 100 laying hens. Each week a hen can either lay 12 eggs or hatch 4 eggs, but not both. At the end of the four-week period all eggs and chicks will be sold: an egg will bring 10 cents, and a chick will bring 60 cents.
It is required to dewater a construction site 80 m by 80 m. The bottom of the construction will be 1.5 m below the initial water surface elevation of 90 m. Four pumps are to be used in 0.5-m diameter wells at the four corners of the site.
A 5-micron droplet of water is being carried in standard air toward a 500-micron drop of water at a relative velocity of 40m/s. Will the two drops collide
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).
Which type of ripple marks would you expect to see on the bed of a river - Describe the sediment that forms.
Your home town is growing so rapidly that another water tower is necessary to meet the needs of the community. Civil and environmental engineers predict that the water tower will need to hold 1.00 X 10.0^6 kilograms of water.
Air flows steadily between two sections in a long, straight portion of 4 in. inside diameter pipe (D1=D2). The uniformly distributed temperature and pressure at each section are p1=100psia, p2=18.4psia, T1=540 R and T2=453 R.
Determine the mass flowrate through boiler needed to produce 5000KW of power.
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