U8 review option-Dimensional analysis

What is the main use of dimensional analysis?

• increase the accuracy of your calculations

• make science easy

• convert between units

What happens when you multiply any number by 1?

• It does not change the number's value.

• It does change the number's value.

What can be cancelled out when the same one is in the numerator (top) and denominator (bottom)?

• numbers and units

• numbers only

• units only

Why are the fractions shown in all examples of conversion factors?

• They all contain an equality

• They convert each other

We are starting with hours and want to convert to minutes.  Which one will we use to get hours to cancel?

• 1 hr / 60 min

• 60 min/1 hr

What happened to the hours on the top equation?

• It is still there but it was not written for simplicity. 

• = 1 so it is removed from the equation.

There are 5280 ft in a mile. If I wanted to convert 5.6 miles into feet, which of the following conversion factors would I use?

• 1 mile = 5280 feet

• 5.6 miles=5280 feet

• 1 foot= 12 inches

If there are 100 cm in a meter, which of the following conversion factors would we use to convert 2.57m into cm.

• 100cm = 1 meter

• 2.57m=12 cm

• 18cm=1287 miles

How many seconds of school are left before Spring break?  Assume there are 34 days of school left and we are in school for 7 hours a day.