Introduction to Units Practice Problems

The earth's circumference is approximately 40.1 Mm (megameters). What is this circumference in kilometers?

Express the following number using powers of 10:

0.5438

What is the fully expanded form, including the necessary zeros, of the number represented by 7.3 × 10²?

Express the Earth-to-Sun distance, approximately 93 million miles with two significant figures, in 'miles' using powers of 10 notation.

The average distance between the Earth and the Moon is approximately 238,855 miles. Calculate this distance in meters and express it using a metric prefix(km).

Express the following measurement in complete decimal form, without using any unit prefixes: 9.8 µm

The position of a free-falling object at any instant is given by the equation: $y=\frac{1}{2}g{t}^2$ , where y and t have units of meter and seconds, respectively.  Determine the unit of constant ‘g’.