kym02
find the force of a bacteria of velocity 20nmμs-1 in the bloodstream of a patient along a vein of length 1mm, if the mass of the bacteria is o.o1μg.
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KonradZuse
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Force is in N, do you know the formula?
kym02
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F=ma, that's all i know
KonradZuse
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what exactly is velocity 20nmμs-1 ???
KonradZuse
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@TuringTest
kym02
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its the rate at which the bacteria is travelling 20 newton metres, and the μ is the symbol for mu,,,,,i'm not really familiar with these units
kym02
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hello?????!!!!!!!!!!!!
ghazi
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\[V= \frac{ 20 * 10^ {-9}}{ 10^{-6} }=20*10^{-3} m/s\] and length = 0.001 m now firstly, find the acceleration using the relation \[U^2=2*a*D\] where D is distance \[a=\frac{ U^2 }{ 2D }=(20*10^{-3})/2*10^{-3}=10 m/s^2\] now
force F=mass * acceleration\[F= 10^{-8}* 10= 10^{-7} N\] = 10^(-7) N
hope this helps you and remember every power is negative :D
kym02
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thank you sooooo much!!!!!!!!!!!!11
ghazi
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:D YW
kym02
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what's the correct way of writing 10^(-7) N?
ghazi
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|dw:1359595444224:dw|
kym02
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oh ok and one more thing is that a multiplication sign?
ghazi
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NO, that is power of 10 or exponent of 10
kym02
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i meant this
ghazi
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i dont know what you meant
kym02
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sorry i tried to draw i meant the sign between the 20 and 10(-7) at the first part where you calculated velocity
ghazi
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thats multiplication hope you have seen it for multiplication thing
kym02
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oh ok thanks for you help! my teacher is a hand full he's so unfair!
ghazi
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its okay :)
kym02
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ok take care bye! i now know who to come for when i need help
ghazi
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see ya :)