# Science, Technology, and Society

## Transportation

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## PROBLEMS

- 1. Name the capacity in kilowatts of a generator delivering current at 220 volts and 1450 amperes.
- 2. One truck averages 8 km per liter of gasoline, while another truck averages 15 mi per gallon. Which truck will go the greater distance on a fuel tank of gasoline if both tanks hold the same amount of gasoline?
- 3. A column of mercury 76 cm high is used to determine the standard atmospheric pressure at sea level. Find the height in inches.
- 4. An automobile wheel makes 432 revolutions in traveling 0.5 miles. How many revolutions will it make in traveling 0.9 miles?
- 5. Gas is flowing through a pipe at the rate of 78 gallons each 6 seconds. How long will it take for 1112 gallons to flow through the pipe?
- 8. An automobile traveled 50 miles on 4 gallons of gasoline. How far should the vehicle travel on a full tank of 25 gallons?
- 7. A bus driver took 1.5 hours to drive 72 miles. At that rate, how long will it take her to drive 420 miles?
- 8. An automobile wheel makes 49 revolutions in traveling 375 ft. How many revolutions per mile does it make?
- 9. Gasoline is selling for $1.06.9 per gallon. It cost Jermaine $21.38 to fill the gas tank in his car. How many gallons did he buy?
- 10. The distance from Justine’s house to the park is 810 meters and the distance from the park to school is 880 meters. If she walked from her house to the park and then to school, how far did she walk? Did she walk more than kilometer? How much farther than a kilometer did she walk?
- 11. Shantel’s father purchased a new car and kept it for four years. At the end of the first year the odometer read 8,425 miles, at the end of the second year 20,132 miles, at the end of the third year 34,142 miles, and at the end of the fourth year 45,366 miles. How many miles did Shantel’s father drive the second year, the third year, the fourth year?
- 12. At a speed of 55 miles per hour, how many minutes will it take to go a distance of 45 miles?
- 13. The family car averages 18 miles per gallon of gasoline. How many gallons will the family car use to go 300 miles?
- 14. Joe’s family started on an automobile trip, filled the gasoline tank and set the odometer at zero. When the family reached Dallas it registered 149 miles. It took 9.5 gallons to refill the tank. How many miles per gallon of gasoline did the family get?
- 15. What distance in feet does the tip of a propeller travel in one revolution if its length (diameter) is 12 feet?
- 16. If the diameter of each Wheel is 35 inches, how far does a car go when the wheels revolve once? How many times do the wheels revolve in a distance of 2 miles?
- Heating or cooling a gas at constant volume
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- Heating or cooling a gas at constant pressure
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- 17. Consider a fuel air mixture in a closed vessel. This gas is at an initial temperature of 110°C and a pressure of 6 atmospheres. The fuel is ignited by a spark, resulting in a temperature of 800°C. What is the pressure per pound ignition?
- 18. Consider a gas contained in a circular tube 8 inches in diameter. The tube has in it a sliding piston with a very small mass.
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- The gas in the piston is at 20°C, at atmospheric temperature, and the piston is 15 inches from the bottom of the cylinder.
- a. Calculate the cross-sectional area of the cylinder
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- b. Calculate the volume of the gas initially in the cylinder.
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- c. Calculate the distance of the piston from the bottom of the cylinder when the gas is heated to 300°C.
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- 19. The Goins family drove 420 miles between 7:15 A.M. and 5:30 P.M. Round off the distance to the nearest hundred miles; the time to the nearest hour. Estimate the average speed. Find their speed to the nearest mile per hour.
- 20. The value of n is 3.14. The formula for the circumference C of a circle with diameter d is C =nd. Estimate the circumference of a wheel with a diameter 38-1/2 inches. Find the correct solution to the nearest 0.1 inch.
- 21. The Dee club drove X miles on Thursday and Y miles on Friday. They drove 350 miles during the two days. The club drove 50 miles farther on Friday than on Thursday. How far did they drive each day?

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DIAGRAM 1-1-5
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Intake Stroke
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: The piston begins its cycle at the top of the cylinder, with the exhaust valve closed and the intake valve open. A vacuum is created as the piston moves downward drawing a vaporized fuel mixture into the cylinder.

(figure available in print form)

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Compression Stroke
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: After drawing in the fuel mixture the piston is forced upward by the crankshaft; the intake valve is closed by linkage of valve lifters, pusrods, and rocker arms driven by a camshaft.

(figure available in print form)

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Power Stroke
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: Combustion takes place when the compressed fuel-air mixture is ignited by the spark plug.

(figure available in print form)

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Exhaust
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: The exhaust valve is open as the piston reaches bottom and move upward again, forcing the burn gases out of the cylinder.

(figure available in print form)

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DIAGRAM 1-1-5
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DIAGRAM 2
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DIAGRAM 3
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DIAGRAM 4
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DIAGRAM 5
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