help please algebra

**casual-rich** · March 17th 2009, 11:47 PM

hi dont know were to put this this is for an assignment and i nee help pritty quick

**u2_wa** · March 18th 2009, 12:06 AM

a) $F=\frac{95}{1.7^2}$ (calculate it yourself in which category it lies)
b) $h=\sqrt{\frac{W}{F}}$
c) $h>\sqrt{\frac{65}{25}}$ m

For remaining questions you should try it yourself and ask if you get stuck anywhere.

**earboth** · March 18th 2009, 12:07 AM

Originally Posted by casual-rich

hi dont know were to put this this is for an assignment and i nee help pritty quick
...

to #4 a): You only have to plug in the given values to calculate F:

$F = \dfrac{95\ kg}{(1.7\ m)^2} = 32.87\ \dfrac{kg}{m^2}$

So this person obviously(!) has crossed the border

b)

$F = \dfrac{w}{h^2}~\implies~h^2=\dfrac wF~\implies~h=\sqrt{\dfrac wF}$

c) Plug in the given values and use the property of being healthy:

$\dfrac{65}{h^2} < 25~\implies~\dfrac{65}{25} < h^2~\implies~h>\sqrt{\dfrac{13}5}\approx 1.61\ m$

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