Hold one end of the cardboard up and roll a coin down the groove. Which hole does it fall through?
Safety: This activity uses a sharp scalpel. Younger mathematicians should ask an adult to help.
You will need
Sharp pencil or pen
$2, $1 and 20c coins
What to do
Cut a piece of corrugated cardboard about 25 cm long and 10 cm wide. Make sure the corrugations are running along the length of your rectangle.
Fold the long side of the cardboard, about 2 cm from edge. Then make another fold about half a centimetre further in from that fold.
Put rubber bands around the cardboard to hold the folds. If you look at the cardboard from the side, it will be in a j shape that creates a groove for the coins to sit in. Put some coins in the folded cardboard and tilt it. The coins should roll freely along the groove.
It’s clear that a one dollar coin is worth two 50 cent coins. Yet here in Australia, 50 cent coins are bigger, heavier, and made of similar metals. So why is the dollar coin worth more?
The short answer is that government tells us. In Australia, there are many laws about our money. One important law in this country states that Australian money must be accepted as a method of payment. These laws make sure that a one dollar coin is worth one dollar. But this isn’t the only way that money can be valued.
It was a big ceremony on Sunday (30.06.2013) when Croatia officially joined the EU. The economic bloc now boasts of 28 member states. About 170 dignitaries were present to mark this historic moment. Among them were 15 head of states and 13 prime ministers. All these dignitaries congregated in Zagreb, Croatia’s capital city. Jose Manuel Barroso and Herman Van Rompuy, the European Commission and European Council president respectively, graced the occasion and made their speeches.
Nothing is more compelling than the unknown. It propels you to go further beyond your limits and defy expectations. Scientists have always been in a continuous search of extraterrestrial life forms of planets that fall within the habitable zone. Extra solar planets – or what is coined as exoplanets were discovered in 1995 which are found to be just outside our solar system. These planets are found to be within range of the sun in which the temperature conditions of the planets’ surface can accommodate liquid water. Water is said to be the main core of life. It is a basic necessity that which sustains life in myriad of forms – which is in fact a tell-tale sign that there might be life present in these planets and it is more so, conducive for life to prosper in such conditions. Researchers are able to verify a planet’s temperature by checking its distance to the central star as well as the planet’s atmospheric components. But now, the recent study of Heller and colleagues on the tidal waves in these earth-like planets which are triggered by low-mass stars will change the conventional concept of what should be considered as a habitable zone.
On 19 April 2013, a pioneer of mathematics passed away. Kenneth Appel’s most famous work involved a new and controversial way of doing mathematics – using a computer.
Mathematics is based on proofs. A proof is a train of thought showing something is definitely true – or definitely false. When you read a proof and understand it, you’ll know the author’s reasoning, and see why they are correct.
Marco Antonio de Dominis was born in 1566 on the island of Rab, Croatia. Prior to attending the Society of Jesus, he enrolled in various education institutions such as university of Padua and the Illyrian college. De Dominis made huge strides in his education rising above the fray to become a leading mathematician. He was simply iconic in everything he ventured in especially in mathematics, theology and science.
Even though his education at Loreto was marked with controversies because of his involvement with the Jesuits, De Dominis overcame his challenges to become a mathematics teacher at Padua and Brescia. His continuous commitment also saw him being employed as a professor of mathematics and rhetoric at Padua and Brescia respectively.
Lots of data can be daunting – how do we know quickly and easily what it all means? Technology is helping us to explore the vast quantities of information we now collect.
There are many technologies to choose from – from the humble graphic calculator or spreadsheet, all the way to inputting data into open source software followed by the use of a 3D modelling suite to create designs. These exciting tools can help you unpack data, knowledge and statistics because of their power and accessibility.
Once statistics have been collected and analysed, a decision must be made on the best way to communicate key messages contained within the data. Often, one or two important pieces of information need to be emphasised. One way to achieve this is through a static visualisation, such as a graph or chart.
A school from Zagreb will be representing Croatia at the international science competition to be held in Turkey. The 22nd edition of the International Research Projects Competition, which is one of the best scientific high school contests in the world, is organised by MEF Educational Institution. The aim of the competition is to attract young science talent and encourage them to be future scientists. The competition gives the students an opportunity to showcase their scientific temperament and ideas by way of working models and projects. The projects may be prepared individually by a student or may be prepared as a group consisting of a maximum of two students and a teacher. The competition is open to all high school students in Turkey and abroad. The competition which will be held from the 7th of May to the 10th of May 2013, will host 120 students from Turkey and another 45 students from international high schools from across the globe.
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A coin collector had three pennies that looked exactly the same. However, one was a fake and weighed less than the other two. While she was looking at them, she got confused and forgot which coin was the fake.
The only scales she had were a pair of balance scales with two trays. The machine can help determine which tray is heavier, or if they balance. The coin collector thought for a while and realised she could work out the fake with only one weighing.
How did she find the fake?
Wanna know the answer?