1) In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 21.0 mi/gal , how many liters of gasoline would you need to buy to complete a 142-km trip in Europe? Use the following conversions: 1km=0.6214mi and 1gal=3.78L.
Answer "15.9" L
2) While in Europe, if you drive 101 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 42.0 mi/gal ? Assume that 1euro=1.26 dollars.
_____ dollars
3) A sprinter set a high school record in track and field, running 200.0 m in 20.8 s . What is the average speed of the sprinter in kilometers per hour?
_____ km/h
4) A specific brand of gourmet chocolate candy contains 7.00 g of dietary fat in each 22.7-g piece. How many kilograms of dietary fat are in a box containing 4.00 lb of candy?
_____ kg
2 answers
Katie, you need to tell us what you think with these problems. It helps if we know exactly what you don't understand about each problem. We don't want to do all of the thinking for you.
To do #1 you want to convert mi/gal to km/L. Use the conversion factors so that the units cancel. You can't go wrong that way.
21.0 mi/gal x (1 km/0.6214 mi) x (1 gal/3.78L) = ? km/L
Then ? km/L x how many L = 142 km. Solve for how many L.
21.0 mi/gal x (1 km/0.6214 mi) x (1 gal/3.78L) = ? km/L
Then ? km/L x how many L = 142 km. Solve for how many L.
8 answers