## kym02 2 years ago 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.

Force is in N, do you know the formula?

2. kym02

F=ma, that's all i know

what exactly is velocity 20nmμs-1 ???

@TuringTest

5. kym02

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

6. kym02

hello?????!!!!!!!!!!!!

7. ghazi

$V= \frac{ 20 * 10^ {-9}}{ 10^{-6} }=20*10^{-3} m/s$ 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

8. kym02

thank you sooooo much!!!!!!!!!!!!11

9. ghazi

:D YW

10. kym02

what's the correct way of writing 10^(-7) N?

11. ghazi

|dw:1359595444224:dw|

12. kym02

oh ok and one more thing is that a multiplication sign?

13. ghazi

NO, that is power of 10 or exponent of 10

14. kym02

i meant this

15. ghazi

i dont know what you meant

16. kym02

sorry i tried to draw i meant the sign between the 20 and 10(-7) at the first part where you calculated velocity

17. ghazi

thats multiplication hope you have seen it for multiplication thing

18. kym02

oh ok thanks for you help! my teacher is a hand full he's so unfair!

19. ghazi

its okay :)

20. kym02

ok take care bye! i now know who to come for when i need help

21. ghazi

see ya :)