1. An automobile travels on a horizontal section of highway at sea level where the temperature is 20-C. Estimate the horsepower needed for a speed of 100 km/h. Make any needed assumptions.
2. Estimate the fuel savings for one year on a semitruck that travels 300 000 mi if fuel costs $2.50/gal if the truck installs both a deflector and a gap seal. Without the deflector and seal the truck averages 4 mi/gal. If an owner desires a three-year payback, how much could an owner pay for the deflector and seal?