few que r here plz ..............
1,at higher altitudes.the atmospheric pressure is low as compared to plains and thus at hilly areas water boils below 100 c or more than 100 c ????????????
2.why a dead body floats in water....i know that up thurst phenomenon n Archemedes law etc but want to know y does a dead body behave like this n why does not a living body?
3.difference between forces of adhesion and cohesion,
4,one leans forward while climbing a hill to increase the base of support na,,,so that the vertical line passing through his centre of gravity may fall within the base..m a bit confused about the exact position of centre of gravity here .5,why is it easier to pull than push a lawn roller?will it make any differenceif the pull or push is applied in a horizontal direction?
6.function of carburettor? in simple way
REGARDS

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Originally Posted by lizaaudacious few que r here plz ..............

You welcome !

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1,at higher altitudes.the atmospheric pressure is low as compared to plains and thus at hilly areas water boils below 100 c or more than 100 c ????????????

Answer:

More than 100 c

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2.why a dead body floats in water....i know that up thurst phenomenon n Archemedes law etc but want to know y does a dead body behave like this n why does not a living body?

Answer:

As a general rule, . a cadaver in the water starts to sink as soon as the air in its lungs is replaced with water. Once submerged, the body stays underwater until the bacteria in the gut and chest cavity produce enough gas—methane, hydrogen sulfide, and carbon dioxide—to float it to the surface like a balloon. (The buildup of methane, hydrogen sulfide, and other gases can take days or weeks, depending on a number of factors.) At first, not all parts of the body inflate the same amount: The torso, which contains the most bacteria, bloats more than the head and limbs. The most buoyant body parts rise first, leaving the head and limbs to drag behind the chest and abdomen. Since arms, legs, and the head can only drape forward from the body, corpses tend to rotate such that the torso floats facedown, with arms and legs hanging beneath it.

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3.difference between forces of adhesion and cohesion

Answer:

Adhesion is the attraction between different substances, like glass and water. Cohesion is the attraction between molecules of the same substance.

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4,one leans forward while climbing a hill to increase the base of support na,,,so that the vertical line passing through his centre of gravity may fall within the base..m a bit confused about the exact position of centre of gravity here .

Answer:

One bends forward while climbing a hill:

To make him/her self balanced, the person bend forward while climbing a hill.

To increase stability

while climbing a hill the person bends forwards and adjusts his centre of gravity in such a way that the vertical line joining the centre of gravity and centre of earth within the base of his feet.

For further details please go through the following link:


http://xtremesport4u.com/extreme-spo...g-performance/

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5,why is it easier to pull than push a lawn roller?will it make any differenceif the pull or push is applied in a horizontal direction?

Answer:

I think that when you pull, your arm and the object you hold onto connect better, and the point where most of the force is focused uses the weight of your body more effectively.

However, if you are pushing, it doesn't matter if you are holding onto something, because it isn't necessary to do so to transfer the object. Even though you have the same amount of grip on the ground, you are leaning toward the object when you push, and are closer. Therefore, you have less distance from where you exert force, and have less force.

or

It depends on the centre of gravity of the body, direction of action of force and the point of action of the force on the body; the effect of push and pull changes. Imagine a lawn roller which is pushed.As we push it, a force which is along the direction of the handle is applied on it.This can create a horizontal component which assist its forward motion and a downward component which increases the normal reaction and thereby enhances the friction which opposes motion. But as we pull it, the direction of the vertical component will be in upward direction and can reduce the normal reaction which in turn reduces the friction and requires less effort to make it move.

or

If an object is put on the ground and we apply a force at an angle A from vertical while pulling then a component of force F cos A.will act against the weight of the object so we can say tha the apparent weight will be
W=mg--F cosA
hence the force of friction will be less i.e friction=mu.(mg-F cosA) so we have to apply less force to move the object.While pushing the vertical component will be downward will add to the wt of the object and hence more force is needed to push the object.i e friction force will be=mu(mg+F cosA)
Now by the property the horizontal force=mu.vertical force.we can write.
F sinA=mu(mg--F cosA)
There force for pulling will be F(pull)=mu.mg/(sinA+mu cosA)
Similarly the force for push will be
F(push)=mu.mg/(sinA-mu.cosA)
therefore
F(push)>F(pull)


The only myth is force of friction, nothing else !

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6.function of carburettor? in simple way

Answer:

Carburettar is to supply fuel to the inlet manifold ,which then goes to ignition chamber. The carburettor supplies the fuel at a metered rate .the idlesettings etc, are all done at the carburettor.The amount of gas supplied depends on demand required.



REGARDS

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thankyu so much 4 ur kind consideration,,,,,,,something more to ask
a, what are protenases and what are proteases?? a little bit ambiguity is here as far as i can judge n find both are enzymes but in few buks it is explained differently....so?blinkblink