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Biology; Chemistry; Physics: Post your doubts here!

exploded diper

exploded diper

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syeda salka hashmi said:
Descibe a named reflex action that is carried by your nervous system?
Click to expand...
when a hand touches a hot substance ...the receptor in the skin send nerve impulses to the cns....which goes to the relay and thn directly to the motor nuerone without going to the brain the motor nerve impulses in the muscles then cause the muscle to contract adn remove the hand...
 
OB909Alpha

OB909Alpha

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multixamza01 said:
Re: Biology,Chemistry & Physics Help Available Here !



Your question is wrong. Barometer measures liquid pressure. Manometer measures gas pressure. You should learn it. It's confusing , and would cost you later on , so get it straight. Manometer measures gas pressure and barometer measures liquid pressure.

Barometer :
Refer to the book for the diagram. Uses the relation :
Pressure in liquid = Density of liquid x gravitational field strength x height of liquid coloumn.

So in other words if any one of the the three varies , the liquid pressure would vary accordingly. For example if a denser liquid is used , the pressure will increase. If the length is increased the pressure increases. But the gravitational field strength will not change as it is the same everywhere on the planet , but if it were to change , yes the pressure would increase.


Manometer :
Refer to book for diagram. ( it is advised you keep the diagram with you while reading this)
Now as you can see a manometer is a U shaped tube. If you pour liquid into it , the liquid levels reach the same height of both sides. Now to measure the gas pressure , you attach a gas supply to one end. If the gas pressure is more then atmospheric pressure ,then the liquid level will fall in the attached tube. Accordingly the level will rise in the other tube. The level that falls and the level that rises are equal. i.e if the level that has fallen is 2 cm , then the level that rose is also 2 cm. The gas pressure is calculated by adding both levels.

Pressure of gas = Level of liquid that falls + Level of liquid that rises.


Hope this helped.
Click to expand...
This helped alot brother. Can you please tell me what are transverse rays?
 
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Awesome12

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exploded diper said:
View attachment 38996
funky brat
eureka!
Click to expand...
Assume the battery supplies 10V Voltage
The current at A will be
10/50
=0.2 A

The resistance at B and C will be
(1/10) + (1/30)
=2/15
Resistance = 15/2 =7.5 ohm

Voltage at B and C= 7.5 * 0.2 = 1.5 V
Voltage remained constant in a parrallel circuit
Current at B = 1.5/10 = 0.15
Current at C = 1.5/30 =0.05

Current at D= 0.2 A
Resistance at D and resistor across = 20 ohm
Voltage = 0.2 * 20 = 4 V

Current at D = 4/40 = 0.1 A
 
Faizan Muhammmad

Faizan Muhammmad

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exploded diper said:
View attachment 38996
funky brat
eureka!
Click to expand...
Simpler Explanation : :D
Current in the three settings connecting in series is same ( 50,10+30,40+40)
Looking mentally you can see current is further dividing in second and third so the smallest cant be the first one
In third current is dividing exactly in half but in second by 1:3
Current is inversely porpotional to resistance so its 30 one rather than 10

Hope it helps :)
 
syeda salka hashmi

syeda salka hashmi

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Awesome12 said:
Assume the battery supplies 10V Voltage
The current at A will be
10/50
=0.2 A

The resistance at B and C will be
(1/10) + (1/30)
=2/15
Resistance = 15/2 =7.5 ohm

Voltage at B and C= 7.5 * 0.2 = 1.5 V
Voltage remained constant in a parrallel circuit
Current at B = 1.5/10 = 0.15
Current at C = 1.5/30 =0.05

Current at D= 0.2 A
Resistance at D and resistor across = 20 ohm
Voltage = 0.2 * 20 = 4 V

Current at D = 4/40 = 0.1 A
Click to expand...
At 'A' current will b smlst
 
funky brat

funky brat

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How do you identify addition or condensation polymerisation? Is it that when there are two different monomers condensation polymerisation will take place? Somebody please explain.
 
A

Awesome12

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funky brat said:
How do you identify addition or condensation polymerisation? Is it that when there are two different monomers condensation polymerisation will take place? Somebody please explain.
Click to expand...
In addition, there is only one monomer usually an unsaturated hydrocarbon. The double bonds are broken and the resulting momoner will be shown in brackets; like this
(momoner)n. The name will also be shown as Poly(momoner). For example, for propene, it will be Polypropene

In condensation, there are two monomers; they can be the same as in the case of Nylon, or different as in the case of Polyester. They join at their functional groups, releasing a product as well, which is normally water. They are usually represented as a long chain, rather than (monomer)n
Hope this helps ;)
 
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