## How to pig out and save the planet

January 2, 2015

Aussie physicist and TV present – that does sound like an oxymoron – Reuben Meerman (A meer man after all. Old joke) had an article published in the BJM (British Medical Journal) with Andrew Brown describing where fat goes when you lose it.

When you burn fat which is a triglyceride or a three-pronged hydrocarbon the formula is:

You breath out the FAT as CO2 and H2O.

BUT:

Oxidizing 10 kilos of human fat requires inhaling 29 kilos of oxygen to produce 28 kilos of carbon dioxide and 11 kilos of water. You can check out how much carbon dioxide you add to the atmosphere when you diet in the following graph:

When you lose weight you add carbon dioxide to the atmosphere, but when you gain weight you take carbon dioxide out of the air. Your carbon footprint from Time for Change blog (See table below) can be neutralised if you put on the following weight:

# We can Pig Out and Save the Planet:

## The Rosetta Project … like throwing a dart from Sydney to Perth and hitting the bullseye

November 28, 2014

Many commentators in Australia claimed that the Philae landing was:

This is equivalent to hitting the bullseye of a dartboard in Perth from Sydney. With a billion euro (\$1.4bn) dart. While blindfolded (as the mission was powered down for almost the entire journey). ABC The Drum

# Did they get the maths right?

Inner bullseye of dartboard = 12.7 mm

67P comet = 4.1 km = 4,100 m at widest point

Distance comet from earth = 520 million km

Actually, hitting the 67P comment was more like roulette as the Rosetta mothership swung into orbit. And, as the earth and the comet are moving, the distance constantly changes, but you can watch the distance changing here.

Fabulous Graphics from the Daily Telegraph

# In the Dart Throwers Universe

We will assume someone can stand on earth and throw a dart at the comet … Yes! They would need very big triceps.

So the commentators aren’t even close. It would still be a feat hitting a bullseye with a dart from 160km, but that would be from Sydney to, um, Nowra on the coast.

# WHY?

The distance from Sydney to Perth is 4100 km. At best the commentators would be talking about throwing a dart from Brisbane to Adelaide is 2044km (below).

## Maths Cure for Wolverine

July 25, 2013

Jackie from Straight Ace Learning ( Maths & Movies ) asked Mathspig to come up with a formula for Wolverines super fast super healing powers. He can regenerate or heal in 5 seconds. In the latest Wolverine Movie he becomes mortal ….

# Wolverine Facts:

### You will need your Web 2 Scientific Calculator (See diag below).

This is what the calculation looks like on the WEB 2 Scientific Calculator.

Tell MIDDLE SCHOOL STUDENTS that

# log2X

is just REVERSE ENGINEERING of

April 27, 2013

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.

.

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.

# = 34 days 17 hrs 17 mins

## Pump Up the volume or Knock, Knock Knockin on Your skull wall!

February 18, 2013

### Just about every piece of audio equipment (microphones, loudspeakers, sound cards, amplifiers, mixers, etc) will have specifications expressed logarithmically (i.e. in dBs).

#### It is measured in INTENSITY (Air Pressure per sq m) or Power (eg. Energy carried per sec in, say, Kilowatts).

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## Harry Potter Needs Maths

February 1, 2012

### You can click on the link here or below (Video will only play on You Tube site):

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## Q = 0.266 x cB x (2g)0.5 x H1.5

### H = Height of the water over the weir, measured behind the weir edge, m

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## Zombie Maths 7: Scientific Notation

December 13, 2011