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Monthly Archives: November 2009
Estimating density
It turns out that estimating density is something that pupils find really hard. I asked a class of pupils to estimate the density of four substances: air, water, mercury and wax. Before you read any further, try to estimate (in … Continue reading
Tagged density, estimation
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Space Tourists
Since 2001 seven people have become space tourists. Dennis Tito, a US entrepreneur, was the first space tourist, in 2001. He was followed by South African entrepreneur and Ubuntu Linux creator Mark Shuttleworth in 2002. Shuttleworth was followed by Gregory Olsen, … Continue reading
Tagged ISS, spacetourism
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Whiteboard
You know you’ve had a good lesson if the whiteboard looks like this after the lesson.
Tagged whiteboard
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Getting rid of data
I had to get rid of an old, partially-functional, memory stick. Deleting all the data, formatting the drive and overwriting the free space is a good start, but any sensible user knows that data is never really gone. The best … Continue reading
Tagged data, microwave
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More slow motion lightning
Following on from this post about slow motion lightning I found a longer video with more strikes, shot from an aircraft. [youtube]http://www.youtube.com/watch?v=Nh15VjGkK5Y[/youtube] More amazing videos and photographs at ztresearch.com.
Tagged lightning
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MPG v L/100km
MPG Miles per gallon (MPG) is a misleading quantity. Miles per gallon is often referred to as a measurement of fuel consumption but it isn’t. Miles per gallon is a measure of the car’s fuel efficiency: how many miles the … Continue reading
Tagged efficiency, fuel
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Baseball bat and centre of mass
How is this possible? [youtube]http://www.youtube.com/watch?v=YngyMco72QA[/youtube] It’s possible because the baseball bat pivots around its centre of mass, but the centre of mass continues to move in a straight line.
Tagged baseball, centreofmass
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