I don't believe there is a specific amount of time that it takes to learn. Some people may learn faster than others. What matters is that you practice consistently and you will learn at a faster pace than if you don't practice often.
The levels of structural organization:
cell ---> tissue ---> organ ---> organ system ---> organism
A dog's eye would be an organ.
A copper wire of diameter 3.256mm carries a current of 6.25mA. the potential difference is mathematically given as
V=2.0657*10^{-4}
<h3>What is the potential difference across a 200m length of the wire?</h3>
Generally, the equation for is mathematically given as
R=Pl/A
Therefore
R=1.72*10^{-8}*2.00/\pi*(1.628)^2*10^{-6}
R=1.652*10^{-2}
In conclusion,
V=IR
V=12.5*10^{-3}*1.652*10^{-2}
V=2.0657*10^{-4}
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melting point of a substance depends on pressure too. at high pressure , the melting point also shifts to higher level. and at low pressure , the melting point shifts to lower level. the inner core of earth is mostly made of iron and temperature inside earth is much higher than the normal melting point of the iron. so ideally the iron inside the core must be in molten state but in reality it is in solid state there because the pressure at the core is very high. due to this high pressure , the melting point of the iron becomes higher than its normal value and hence it does not melt inside the core.