1. Intro to Physics Units

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

Astronomers often detect radio waves with wavelengths of 3,000,000,000 nm. What is this wavelength expressed in decameters (dam)?

Rewrite 0.00016 kg in scientific notation.

Rewrite 299,800,000 m/s in scientific notation.

The position of an object is given by 𝓍 = At + Bt², where 𝓍 is in meters and t is in seconds.

(a) What are the units of A and B?

Write the following numbers in powers of 10 notation:

(e) 0.219

Write out the following numbers in full with the correct number of zeros:

(c) 2.5 x 10⁻¹

Time intervals measured with a physical stopwatch typically have an uncertainty of about 0.2 s, due to human reaction time at the start and stop moments. What is the percent uncertainty of a hand-timed measurement of 4.5 min?