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kitchen fires

November 30th, 2008

Very effective and informative!

This is something everyone needs to know!!!!

Kitchen Fire

I never realized that a wet dishcloth/towel can be a one-size-fits-all
lid to cover a fire in a pan!

This is a dramatic video (30-second, very short) about how to deal with
a common kitchen fire … oil in a frying pan. Read the following
introduction, then watch the show …. It’s a real eye -opener!!

At the Fire Fighting Training school they would demonstrate this with a
deep fat fryer set on the fire field. An instructor would don a fire
suit and using an 8 oz cup at the end of a 10 foot pole toss water onto
the grease fire. The results got the attention of the students.

The water, being heavier than oil, sinks to the bottom where it
instantly becomes superheated. The explosive force of the steam blows
the burning oil up and out. On the open field, it became a thirty foot
high fireball that resembled a nuclear blast. Inside the confines of a
kitchen, the fire ball hits the ceiling and fills the entire room.

Also, do not throw sugar or flour on a grease fire. One cup creates the
explosive force of two sticks of dynamite. This is a powerful
message—-watch the video and don’t forget what you see. Tell your
whole family about this video. Or better yet, send this to them.

See attached file: AKitchenOilFire.wmv or:

 

 

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speed of dolphins figured out

November 26th, 2008

 

The team tracked the bubbles around a dolphin. The more prominent the colour, the faster the water is moving.

New research has shown how dolphins achieve their blinding speeds.

Gray’s Paradox – named after British zoologist Sir James Gray – proposed that dolphins simply do not have the strength to swim so fast.

But researchers at the Rensselaer Polytechnic Institute in the US have now studied the movement of water around dolphins as they swim.

The results show that dolphins can exert as much as 180kg (400lb) of force with their tails.

Gray had supposed they could produce less than a tenth of this amount, and imagined that something about the dolphins’ skin allowed them to overcome the force of drag in the water and reach high speeds.

“For the first time, I think we can safely say the puzzle is solved,” said Tim Wei, the Rensselaer scientist who led the study.

“The short answer is that dolphins are simply much stronger than Gray or many other people ever imagined.”

To determine this, Professor Wei used a new method of measuring the movement of water that he originally developed to track Olympic swimmers.

Dolphin and Cilla (BBC)

Keeping upright for Cilla Black requires a lot more force

The technique employs digital particle image velocimetry, which measures the speed of water movements around a swimming dolphin or human.

Retired US Navy dolphins Primo and Puka were filmed swimming through a tank filled with millions of tiny bubbles.

Software tracked the movement of individual bubbles, determining their speed and direction, and assigning them a colour.

Professor Wei then used force measurement concepts from aerospace research to translate those velocities into a force that the dolphins’ tails were producing – nearly 100kg (200lb) on average.

When “walking” – keeping upright mostly above water with powerful flips of their tails – the dolphins produced as much as 180kg of force.

Professor Wei will go on to study the motion and force generation of other sea animals

 

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