Question

The speed of a car is 16 meters per second. What is this speed in miles per hour? What is
а
this speed in miles per hour? (1.61 km = 1 mile, 60 seconds = 1 minute, 60 minutes = 1 hour)
Select one:
a. 180 miles per hour
b. 58 miles per hour
O c. 7.2 miles per hour
d. 36 miles/hour
e. 360 miles per hour

Answer 1

Conversion Factors:

1.61 km = 1 mile

60 sec = 1 min

60 min = 1 hour

Use dimensional analysis to solve.

$=\frac{16\ meters}{1\ second}$ × $\frac{1\ km}{1000\ meters}$ × $\frac{1 mile}{1.61\ km}$ × $\frac{60\ seconds}{1\ min}$ × $\frac{60\ min}{1\ hour}$

$=35.77639752$

= 36 miles/hour

If done properly, you should be left with the units miles/hour