# Magnitudes and Scale

How do we represent really big numbers?

# Task 1

View the prezi below

http://prezi.com/dfhxvocmt1fl/?utm_campaign=share&utm_medium=copy&rc=ex0share

# Task 2

State the approximate value of the following quantities **in SI units to the nearest order of magnitude**. The first two have been answered for you as examples.

**1) Length of a day**

SI unit for time = second. 1 hour = 60 mins, 1 min = 60 seconds so 24 hours = 86400 seconds =** 8.64 x 10 ^{4} seconds.**

**2) Mass of a bus**

If we say a bus is approximately 2 tons, 2 tons is 2000kg (kg is the SI unit for mass)

= **2 x 10 ^{3} kg**

## REMEMBER - your answer must be in SI units and standard form!

**3) If an average person has a mass of 60kg, and the world population is currently around 7 billion people, estimate the mass of the human race.**

**4) The size of a microbe (the clue is in the name!).**

**5) The energy in a snack of your choice.**

**6) The width of your hand.**

**7) The height of a door.**

**8) The width of your thumb nail.**

**9) The number of seconds you have been calculating these answers!**

**10) Your age (yes it is constantly changing but this is an estimate...)**

**Share your answers on your blog and post a link in the comments section below.**