Question

a) If an electric car is capable of going 225 km on a singer charge, how many charges will it need to travel from Seattle,Washington, to San Diego,California,a distance of 1257 mi,assuming that the trip begins with a full charge?
b) If a migrating loon flies at an average speed of 14 m/s, what is the average speed in mi/hr?
c) What is the engine piston displacement in liters of an engine whose displacement is listed as 450 in^3?
d) In March 1989 the Exxon Valdez ran around and spilled 240,000 barrels of crude petroleum off the coast of Alaska. One barrel of petroleum is equal to 42 gal. How many liters of petroleum were spilled?

*Show work,if possible.

Answer 1

a)

1 charge = 225 km = 225000 m

then

D = 1257 mi; how many charges?

change D to m

D = 1257 mi --> 1257*1609.34 = 2022940.38km

then we need

2022940.38/225000 = 8.99 charges; therefore, at least 9 complete charges are needed

b)

V = 14 m/s ; change to mi/h

change s to hours

V = 14m /s * 3600 s/h = 50400 m/h

change m to mi

1609.34 m = 1 mi so

50400/1609.34 = 31.317mi per hour

V = 31.317 mi/h

c)

change 450 in^3 to liter

the conversion factor:

1 liter = 61.0237 in^3

then

450/61.0237 = 7.374184 liters

d)

V = 240000 barrels

change to galons

1 barrel = 42 gal so

240000 *42 = 10080000 gal

1 gal = 3.78 liter so

10080000*3.78 = 38102400 liter or 3.81*10^7 liters