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A car has the following characteristics: weight = 18000 N; cross-sectional area = 2.5 m^2, drag coefficient = 0.5; rolling friction coefficient = 0.02. The energy content of gasoline is 3.5E10^7 Joules/Liter. The efficiency of fuel use varies with engine and drivetrain operation as described below.
(a) First consider highway driving. Assume a constant velocity of 27 m/s (60.4 mph) on level ground. Under these conditions the efficiency of the engine plus auxiliaries is 30 percent and the efficiency of the drivetrain is 85 percent. What is the fuel consumption in miles/liter under these conditions? Assume the density of air = 1.2 kg/m^3.
(b) Next consider city driving. As you know from your own experience, this is mostly start-stop driving. Assume that there are three start-stop cycles per kilometer of travel (five per mile). For each cycle the car starts from rest, accelerates up to 13 m/s (29.1 mph), then instantaneously stops. Under these conditions the net engine efficiency drops to 20 percent, and the drivetrain efficiency is 80 percent. What is the fuel consumption (miles/liter) for this city driving cycle?
If the 50 kg crate starts from rest and travels a distance of 6m up the plane in 4s, determine the magnitude of force P acting on the crate. The coefficient of Kinetic friction between the crate and the ground is 0.25
The total saturated thickness of the aquifer is 15 m. Predict the concentration distribution along the water table after 5110 days, assuming a linear groundwater velocity of 1.6x10-3; dispersivities in x, y, and z of 5.0 m, 0.5 m, and 0.1 m
What is the cost breakdown structure(CBS)? What are its purposes? What is included (or excluded)? How does it relate to a work breakdown structure (WBS)?
Christian is picking out ties for a business trip. Anastasia knows from experience that Christian has a 50% chance of picking a grey tie. Find the probability Christian won't pick out a grey tie until the 3rd or 4th tie.
Determine the magnitude and direction of the force P in so that the resultant of P and the 900N force is a vertical force of 2700N directed downward using.
A ping-pong ball (diameter = 40mm, weight= .03 N Volume =4piR^3/3) is released from the bottom of a swimming pool. What is the terminal velocity of the ping pong ball in the water
a two stage high rate trickling plant is to treat a municipal wastewater having a flow of 2.0mgd. pertinent data: influent BOD5 = 200mg/l, BOD5 removal by primary clarifier = 33%, filter bed depth = 5 to 7ft
If the queue clears exactly at the end of the effective green D/D/1 queuing applies, determine the total vehicle delay in the cycle (in veh-sec) .
The herbicide 2,4,D, is applied to a golf course at a rate of 1.2 kg/ha. The organic matter content of the soil is 1%, bulk density is 1.3 g/cm3, and water content is 0.3. a) What fraction of the herbicide is adsorbed, and what fraction is dissolve..
A 0.4m^3 moist soil sample has the following: Moist mass = 711.2 kg, Dry mass 623.9 kg, Specific gravity of soil solids = 2.68 Estimate: a). Moisture content. b). Moist density.
Calculate the heat transfer per unit mass during the expansion if the exit temperature is 50 degrees celcius.
You fill a 2-cubic foot wheelbarrow to the top with aggregate. if the specific gravity of the aggregate is 2.548 and 18% of the aggregate is void spaces, how much does the aggregate in the wheelbarrow weight?
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