Category: 01 Units and Measurement

# 1.7 Propagation of Error/Uncertainty

This video provides an overview of the propagation rules:

Watch this video for a worked example for the product rule.

Watch this video if you want to see the “proof” of the product rule.

# 1.2 Prefixes

From the tiniest to the most humongous, this classic powers-of-ten video shows us the mind blowing scale of the natural world. It now has an updated version in the form of an 🍏APPLET which allows you to navigate through the powers-of-ten. Enjoy.

# 103 Propagation of Errors/Uncertainties

🎬Video1: Run through of the rules for error propagation

🎬Video2: A worked example ($T=2\pi \sqrt{\frac{L}{g}}$)

🎬Video3: Proof of the product rule

# 102 Powers of Ten

From the tiniest to the most humongous, this classic powers-of-ten video shows us the mind blowing scale of the natural world. It now has an updated version in the form of an
🍏APPLET which allows you to navigate through the powers-of-ten. Enjoy.

# 101 Revamped SI Base Units

“On November 16, 2018, in Versailles, France, a group of 60 countries made history.  With a unanimous vote, they dramatically transformed the international system that underpins global science and trade. This single action finally realized scientists’ 150-year dream of a measurement system based entirely on unchanging fundamental properties of nature.”

So how are the SI units defined now? Read here.

# xmPuzzle 003 Six Ants

Question:

Six small ants are each at the vertex of regular hexagon of side 60 cm. The 1st sets out towards the 2nd , the 2nd towards the 3rd … and the 6th towards the 1st, with uniform speed of 5 cm s-1. During their motion each of them always heads towards its respective target ant. How much time has elapsed and what distance do the ants cover before they meet?