What is the terminal velocity that a 40-hp car will attain when it coasts down a

Question

What is the terminal velocity that a 40-hp car will attain when it coasts down a 10% grade? What is the maximum velocity it reaches on a flat road? Assume that the car weights 3, 200 lb, has a frontal area of 30 square feet, and a rolling resistance coefficient of 0.015, and aerodynamic drag coefficient of 0.55. The efficiencies of various modes of transportation in carrying cargo over long distances are measured in terms of a. Horsepower per tonne-mile. b. Btu per tonne-miles. Horsepower per tonne. Btu per tonne. Tonne per hour. According to a study conducted by ExxonMobil (Figure 6-11), by 2040 a. The fuel efficiency of average passenger car will reach 47 mpg. b. Roughly, 90% of all vehicles will be hybrid. c. The number of diesel engines in the market will surpass that conventional gasoline engines. d. Most of the efficiency improvement is the result of better maintenance. e. All of the above. The main strokes of a four-stroke, internal combustion engine are a. Intake, expansion, compression, and exhaust. b. Compression, ignition, expansion, and exhaust. c. Intake, compression, power, and exhaust. d. Intake, compression, ignition, and expansion e. Intake, ignition, expansion, and exhaust. To increase the efficiency of a spark ignition engine, we must a. Increase the compression ratio. b. Use fuels with higher flame temperatures. c. Reduce exhaust temperature. d. Maintain proper tire pressure. e. All of the above. The power required to propel a vehicle over a given distance can be calculated as a. Speed divided by distance. b. Power times distance. c. Speed times distance. d. Force times distance. e. Force times speed. The main barrier to wide-scale use of fuel-cell vehicles is a. Finding or developing light electric motors and generators. b. Developing faster charging system. c. Developing lighter and stronger chassis. d. Developing better hydrogen storage system and reducing cost. e. Developing batteries with higher energy and power densities. Aerodynamic resistance dominates all other resistances in vehicles a. Cruising at speeds below 40 km/hr (25 mph) b. Only during stop-and-go traffic. c. During acceleration. d. At speeds exceeding 40 km/hr (25 mph). e. Never, it is always less than rolling resistance. Nitric oxides are produced mainly as a result of a. Incomplete combustion. b. Quenching by cold surfaces. c. The reaction of nitrogen and oxygen in the air at high temperatures. d. Burning a very rich mixture. e. All of the above. Which of the following emissions cannot be controlled by catalytic converters? a. Carbon monoxide b. Carbon dioxide c. Nitric oxide d. Hydrocarbons e. None of the above

Explanation / Answer

8.

c. the reaction of nitrogen and oxygen in the air at high temperature.

9.

c. Nitric oxide

5.

e. Force times speed

3

c.Intake, compression, Power and exhaust

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