Unit Conversions and Dimensional Analysis

Which conversion factor would you use to convert from cm to inches?

• $\frac{1\ in}{2.54\ cm}$

• $\frac{2.54\ cm}{1\ in}$

What must be true about a conversion factor when converting from one unit to another?

• The units in the numerator must be the same as the units in the denominator

• The number "1" must always be in the numerator

• The numerator must be equal to the denominator.

What prefix represents 10^3?

• milli
• deca
• centi
• kilo

You know 1000 mg = 1 g. Convert 2.5 grams into milligrams. (Hint: You can Bunny Hop this one!)

• 25 mg

• 25,000 mg

• 250 mg

• 2500 mg

The Olympic record for the high jump is just over 2.6 yards. What is that distance in feet? (3 ft = 1 yd)

• 0.867 ft

• 7.8 ft

• 8.07 ft

• 8.27 ft

The waiting time to ride a roller coaster is 20 minutes when 150 people are in line. How long is the waiting time when 240 people are in line?

• 32 people

• 32 minutes

• 12.5 minutes

• 12.5 people

How many minutes are in a school year, 187 days?

• 269,280 min.

• 16,200 min.

• 4,488 min.

• 269,000 min.

Convert 15.34 cm to nm. (1 cm = 10⁷ nm)

• 4351 nm
• 1.534 nm
• 1.534 x 10⁸ nm

• 15.34 x 10⁵ nm

The moon is 250,000 miles from earth. How many feet is that? (1 mile = 5280 feet)

• 47, 348 ft.

• 47 ft.

• 1.32 X 10⁶ ft.

• 1.3 X 10⁹ ft.

Tags

NGSS.MS-ESS1-3

Convert 62 miles/hour to feet/second.

• 5,456 feet/second

• 0.003 feet/second

• 90.9 feet/second

• 909 feet/second