Category Archives: Technology and Engineering

Putt-putt boats and the reverse sprinkler — Matthew Lee

In the first FOTW,(here: https://quantapublication.wordpress.com/2011/01/16/putt-putt-boats-matthew-lee/) we took a look at the mechanism by which the humble putt-putt boat propels itself through water, and tried to explain how the boat manages to move forward at all despite sucking and blowing water in … Continue reading

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2 Simple Facts — Lee Zi Yang

The Earth is smoother than a billiard ball The Earth may seem all bumpy and uneven, with molehills, mountains, trenches, buildings and what nots. But really if you shrank it to the size of a billiard ball, it’s smoother! The standard … Continue reading

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Bubble, bubble, toil and trouble… a closer look at cavitation – Chew Hong En

The next time you boil water in a beaker over a Bunsen flame, consider how the water actually boils: Even before reaching boiling point, small bubbles begin to form near the base and sides of the beaker, with the bubbling … Continue reading

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Induction Cooking – Cheng Tianran

What Is “Induction Cooking”? Cooking is the application of heat to food. Food being prepared in the home is very rarely if ever cooked on a rangetop except in or on a cooking vessel of some sort–pot, pan, whatever. Thus, … Continue reading

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The PID Control Algorithm – Matthew Lee

Have you seen a line-following robot in action before? These robots zip around by tracing the black-white boundary between the dark line and the lighter ground via negative feedback. If the robot is on the dark line, it veers to … Continue reading

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Semiconductors and Diodes – Soham Ghosh

As all of the world would agree, semiconductors are one of the major creations of Physics in the field of electronics. Semiconductors are almost an essential part of every circuit and integrated circuit today.  So this week’s fact of the … Continue reading

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Putt-Putt Boats – Matthew Lee

Description of putt-putt boats: putt-putt-what? “Putt-putt” boats are toy boats that propel themselves through water through the repeated firing of jets of water. In each cycle, water is expelled out of a pipe at the rear of the boat, pushing … Continue reading

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