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To determine the effect of fuel grade in fuel efficiency, 80 new cars of the same make with identical engines, were each driven for 1000 miles. Forty of the cars ran on regular fuel, and the other forty received premium grade fuel. The cars with the regular fuel averaged 27.2 miles/gal with a standard deviation of 1.2 miles/gal. The cars with the premium fuel averaged 28.1 miles/gal with a standard deviation of 2.0 miles/gal. Can you conclude that this type of car gets better mileage with premium grade fuel?
A container of petrol on a set of scales is used to measure the rate at which fuel is used by an engine under test. In one test the weight measured by the scales decreases by 25.0 N in 1 hour.
What should be the length of an aluminum wire of 6 mm in diameter so it can be twisted one full turn without exceeding a shear stress of 42 MPa G = 27 GPa.
A college student borrows $1500 during his senior year. The loan is to be repaid in 20 equal quarterly installments. The interest rate is 5% per year with the first payment to be made 3 years after the date of the loan. What will be the approximat..
Annual rainfall over the watershed is 36 inches and the annual runoff from the catchment is 12 inches. Evaporation from the reservoir averages 40 inches per year. The municipal water demand equals 100 million gallons per day
A developer wants to provide access to a new building from a driveway placed 1000 ft upstream of a busy intersection. He is concerned that queues developing during the red phase of the signal at the intersection will block access.
Can a contractor claim that liquidated damages should be limited Because of political unrest, only 20% of rooms are occupied. Liquidated damages are set to $30000 per day -> reasonable amount Contractor is late 15 days.
determine critical depth in a circular pipe of 36 inches diameter and roughness coefficient of 0.015 The flow rate is 15 cfs , So = 0.002
A flow of 0.1 cum/s flows down in a rectangular channel of width of 0.6m and having and adjustable bottom slope. If chezys constant C is 56, determine the bottom slope necessary for uniform flow with a depth of flow 0.3m.
A company has been discharging its waste into a holding pit for a long time. For the last several years, the pit has been full and overflowing into a local river. The waste concentration has been nearly constant at 10 mg/L of the pollutant of inte..
A froth flotation process is used to concentrate copper ore. It is a two stage process with a rougher stage followed by a cleaner stage. The cleaner tailings are returned to the rougher flotation.
A 3-m-thick, wide fill (γ = 19 kN/m3) is placed over a soil profile consisting of 6 m of plastic clay (γ = 16 kN/m3, e0, = 1.7, Cc, = 1.2, OCR= 1.4, Cr/Cc, = 0.15) over 10 m of organic silt
An observer standing on a beach can just see the top of a lighthouse 15 miles away. The eye height of the observer abouve sea level is 5.7 feet. what is the height of the lighthouse above sea level
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