Converting Units with Dimensional Analysis

Melissa Maribel introduces a method for converting units using conversion factors. She demonstrates converting 21 yards to feet using a single conversion factor and then explains converting 21 yards to miles using multiple conversion factors. The video emphasizes the importance of aligning units for cancellation and considering significant figures. Melissa encourages viewers to stay determined and explore more complex conversions in other videos.

What is the first step in choosing the correct conversion factor?

• Use a conversion factor that you remember from memory.

• Select the conversion factor with the largest number.

• Choose a conversion factor with the same unit as the given unit.

• Pick any random conversion factor.

How many feet are there in 21 yards?

• 42 feet

• 105 feet

• 63 feet

• 84 feet

What is the first conversion factor used to convert 21 yards to miles?

• Feet to miles

• Yards to feet

• Yards to meters

• Meters to miles

What is the second conversion factor used to convert 21 yards to miles?

• Meters to miles

• Feet to miles

• Yards to meters

• Yards to feet

Why is it important to align the same units across from each other?

• To double the final result

• To make the calculation easier

• To ensure the units cancel out

• To avoid using a calculator

What should you do after multiplying straight across in a conversion problem?

• Add the bottom units

• Multiply by the bottom units again

• Subtract the top units

• Divide by the bottom units multiplied

How many significant figures should the final answer have if the given number has 2 sig figs?

• 1 sig fig

• 2 sig figs

• 4 sig figs

• 3 sig figs

What is the final step in a conversion problem involving multiple conversion factors?

• Add all the conversion factors

• Round the answer to the correct number of significant figures

• Multiply by the given unit

• Subtract the given unit

What should you do if you have a question with three conversion factors?

• Ignore the third factor

• Check the referenced video for an explanation

• Use only the first two factors

• Guess the answer

What is the key message Melissa Maribel wants to convey at the end of the video?

• Stay determined, you can do this

• Skip the difficult questions

• Give up if it's too hard

• Ask someone else to do it