Archive for the ‘Engineering’ Category

I need to keep plants hot in an ice chest. How can I for a long period of time?

Posted on May 11th, 2010 by admin  |  3 Comments »

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bob K asked:


I need to keep plants hot in an ice chest. How can I for a long period of time?

I need to keep plants hot in an ice chest. How can I for a long period of time. It’s for a science project. Right now I have a heating pad in the ice chest with them but it’s not getting very hot? Any other way to do it safely and cheaply?
It’s for a science project my daughter is doing. I have 1 ice chest with a large frozen milk jug of water. We are comparing the growing rate in cold vs hot temps.

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How do domestic electrical hot water cylinders work?

Posted on April 11th, 2010 by admin  |  1 Comment »

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Numbat asked:


In some countries, hot water is generated in houses by heating large cylinders of water. Quite often, this is done late at night when demand for electricity is low, called off peak heating. The cylinders are connected to the main water supply and so operate at main pressure. But how do they manage to keep the hot water from being diluted by cold water when a hot tap is opened?

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What new invention would you create with an already existing technology?

Posted on April 2nd, 2010 by admin  |  2 Comments »

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Doc S asked:


What new invention would you create with an already existing technology?

For example, some new technologies have been already invented such as sunglasses with a build-in mp3 player. What other new invention can be created like this?

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