q.earth quake have helped a great deal in deciphering the internal structure of the earth .....comment on this statement
REGARDS

http://www.answersingenesis.org/crea...26/i3/rats.asp

the detailed answer will be required for Geography students but as far as EDS is concerned (depending upon the value of marks) the following note is more than enough:

"Earthquakes initiate different types of seismic waves to travel through the earth's inner body. our knowledge about earth's interior comes from the study of all such waves. there is alteration in speed and direction (refraction) of the waves as they enter a new medium (type of material). Therefore by analzying the changes in speed and directions of the sesimic waves, scientists are able to identify the different layers in the Earth's interior."

those who want to know the details consult this website:

http://www.visionlearning.com/librar...wer.php?mid=69

A diagram or two will surely help if the question carries 5 or so marks

in my opinion none: A flask is supposed to be made up of materials that are almost perfect insulators of heat. therefore it should stop/inhibit the loss of heat energy. it needs to be a poor conductor of heat, a poor radiator of heat.

thus, a flask does not or should not transfer heat. Although it would radiate/conduct heat to the surroundings (in real life) because ordinary flasks are not made up of perfect insulators..!!

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Umar Abbas Babar
I Know I am Bad But When Bad is the Best, Bad is the Only Choice

only rock which can float on water?
differentiate between grey and black water?
what is latest found chemical element?
oldest, largest, highest pyramids?
first MNC?
what is sea of tranquilty?
why bats always leave to left of cave?

A man weighing 72 kg is riding a bicycle. How much of his weight will be on the front wheel of the bicycle?

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Verily, His command, when He intends a thing, is only that He says "Be!" - and it is! (Al-Quran)

ignoring the weight of the bike, and assuming that the seat is in the middle of the bicycle and assuming that the cycle is uniforming weighed across both the sides of the seat:

"Half of his weight will be distributed on the front tyre and the other half on the rear tyre"

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Umar Abbas Babar
I Know I am Bad But When Bad is the Best, Bad is the Only Choice

Dear Umar,

I think simply cutting the weight in half because a bicycle has two wheels would be over simplification. To me it doesn't seem to be that easy. If it was this much simple, it shouldn't likely qualify for a question even. Can we think of some other logic?

P.S : The book I borrowed this question from, gives a different answer. I can't comprehend the logic either except that the the rider might have moved his legs on the foot bearers and that weight must be added to the weight upon the front wheel.

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Verily, His command, when He intends a thing, is only that He says "Be!" - and it is! (Al-Quran)

brother my assumption was that the seat was in the middle, which is never the case with any bicycle. in reality it is more closer to the rear wheel...was there any diagram given?

the distance of the seat would tell which tyre takes more weight! if the rear seat is closer to the back tyre, then it will take more weight percentage. if it closer to the front tyre it will take more weight.

in a common day to day bicycle, with the seat near the back tyre 55-6o% of the weight is transferred on the back wheel and around 40-45% is on the front wheel.

please find the source for my proof:

http://www.cptips.com/bkefit.htm

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Umar Abbas Babar
I Know I am Bad But When Bad is the Best, Bad is the Only Choice

Dear Umar,
Your assumption was slightly incorrect. No any diagram is given with the question. However, the reference you have now mentioned clarifies the logic as well as justifies the answer given in the book.

The rear wheel should get 55-60% weight. And the front wheel 40-45%.
Based on this, we can say if total weight is 72 Kg, then the rear should get approximately 42 Kg and the front wheel should get approx. 30 Kg. And amazingly, this answer matches with that of the book.

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Verily, His command, when He intends a thing, is only that He says "Be!" - and it is! (Al-Quran)

that's why brother an engineer would always define his assumptions before he gives you an answer ...

__________________
Umar Abbas Babar
I Know I am Bad But When Bad is the Best, Bad is the Only Choice