Sunday, February 21, 2016

What happens when rubber band is heated?

In previous article , we have come to know about thermal expansion. As materials are made of molecules which will be always colliding with each other; heating causes these molecules to collide even harder thus resulting in expansion.

When heating stops, materials will contract too . Repetitive expansion and contraction will result in cracks in the material.

Rubber bands are different from many other materials as their molecules are very long chains , called polymers.

Now because of these unusual structure of polymers , when heating causes the rubber band to get CONTRACT . When these long chains of polymers get hotter and vibrate, they get shorten. This results in contraction of rubber when heated.

When the chains cool down , they relax and stretch out resulting in the expansion of rubber band.

Friday, February 19, 2016

Bhoota- Kola of Tulunaadu

Yesterday my uncle had sent me a video of bhoota kola. I bowed my head to the divine spirit.

The diety shown in the video in his full spirit ( diety is coming on a follower ) was sitting on fire !

Not only for the first time , but several times . I know people may think it as a trick to fool the people . But same thing he repeated . It is definitely not the trick.

After some time , bhoota threw itself on fire ! It was so horrifying. I don't want to discuss the psychological reason behind this. But surely it is proving that there exists a divine power.

Because no one will dare to touch the fire even in subconscious mind !

Tuesday, February 16, 2016

Heat expansion

We have seen wires hanging from electric poles. Ever wondered why do they tied the wires between electric poles so loose ?



As I always think myself quite different from others, I just wondered. Another thing is same wires which were hanging loose in winter , look stretched and tightly held between poles in summer !


This is just an example of heat expansion or thermal expansion . Now what is getting expanded? The wires , obviously .

Why do they get expand in summer or when they get heated?

It is the property of metals. They get expand when they get heated or exposed to heat. Now the metallic wires between electric poles are not an exemption for this phenomena.

As they get expand during summer, if they were tied tightly between the poles , then during summer there is a chance of cutting down of wires because of heat expansion.

So in order to prevent that it is better to give extra space to them when they get expand. That's why they are loosely tied.

They look sagging during winter and look tightly held up during summer because of heat expansion.

Friday, February 12, 2016

How do springs work?

Springs when used , either they store energy or absorb energy.

When we are pulling or pushing the spring, we are using the force , that means we are doing WORK and using energy.

Tighter the spring, harder it is to deform. The energy what we use is not getting lost , as per law of conservation of energy.

Then where it is stored? Most of this energy is stored as POTENTIAL ENERGY in the spring. When we release the spring, even this energy is released.

For example : when we wind a mechanical clock , we are storing the energy by tightening the spring. As the spring loosens, this energy is slowly released and powers the gears inside and turns the hands around clock face.

Now when all of this potential energy which was stored in spring is over , turning of hands on clock face too stops.

Thursday, February 11, 2016

Why is apple called false fruit?

Fruits are divided into two categories: true fruits and false fruits.

True fruit is formed from the ovary of flower. An apple's flesh is not derived from ovary of flower but instead it is the swollen part of stem.

The real fruit is in the core, the part which we throw away !

Saturday, February 6, 2016

Son of Shoorpanakha

Shoorpanakha was the sister of Ravan .

Although , she is a demon / asura woman , even she had a family. She was married to another demon named Vidhyujjihava . He was serving in the army of Ravan .

Ravan had killed him . To soothe his sister , Ravan had given her the entire forest to live . Shoorpanakha had a son too , by the name Shambhooka.

Shambhooka was accidently killed by Laxman when he was taken the form as a tree . Laxman had cut the tree for their home.

Tuesday, February 2, 2016

ನೀರುಳ್ಳಿ ಪಕೋಡ ಮಾಡುವ ವಿಧಾನ

ಇದು ನನ್ನ ತಾಯಿಯ ವಿಧಾನ .

ಬೇಕಾಗುವ ಸಾಮಗ್ರಿಗಳು

ನೀರುಳ್ಳಿ - ಉದ್ದುದ್ದಕ್ಕೆ ಹೆಚ್ಚಿದ್ದು  - ೩
ಖಾರದ ಪುಡಿ
ಉಪ್ಪು - ರುಚಿಗೆ ತಕ್ಕಷ್ಟು
ಕೊತ್ತಂಬರಿ ಸೊಪ್ಪು  -- ಸಣ್ಣಗೆ ಹೆಚ್ಚಿದ್ದು
ಕಡಲೆ ಹಿಟ್ಟು

ಮಾಡುವ ವಿಧಾನ --

ಒಂದು ಬೌಲ್ ನಲ್ಲಿ ನೀರುಳ್ಳಿ , ಖಾರದ ಪುಡಿ , ಸಕ್ಕರೆ , ಉಪ್ಪು , ಕೊತ್ತಂಬರಿ ಸೊಪ್ಪು ಎಲ್ಲ ಹಾಕಿ ಮಿಕ್ಸ್ ಮಾಡಬೇಕು . ಈ ಮಿಶ್ರಣವನ್ನು ೧೦ - ೧೫ ನಿಮಿಷ ಹಾಗೇ ಬಿಡಬೇಕು . ಏಕೆಂದರೆ ನೀರುಳ್ಳಿ ನೀರು ಬಿಡುತ್ತದೆ . ನಂತರ ಇದಕ್ಕೆ ಕಡಲೆ ಹಿಟ್ಟು ಹಾಕಿ ಚೆನ್ನಾಗಿ ಕಲಸಬೇಕು . ಪ್ರತ್ಯೇಕ ನೀರು ಹಾಕುವ ಅಗತ್ಯವಿಲ್ಲ .
ನಂತರ ಕಾದ ಎಣ್ಣೆಯಲ್ಲಿ ಮಿಶ್ರಣದಲ್ಲಿ ಅದ್ದಿದ ನೀರುಳ್ಳಿ ತುಂಡುಗಳನ್ನು ಡೀಪ್ ಫ್ರೈ ಮಾಡಬೇಕು .