Physics Simple Calculation

http://www.mathhelpforum.com/math-he...cons/icon1.gif **please help, some basic physic formulae i think**

http://img411.imageshack.us/img411/9212/57768216.png

i need ur help regarding this, ive tryed by my self but im soo sure that ive done wrongly

here it comes

the figure shows that how i oversizing the hex 1/2" nut by oversizing machine. the pressure which is **3.5kg/mm sq** is pushes the nut thru the tapper of a **100 mm length**. how can i determine the **time taken**,**t** for the nut to going thru the 100mm tapper

here is the detail that may required

size of nut: **1/2 inch** hexagonal nut (internal dia of nut = 1/2 inch)

pressure, P: **3.5kg/mm sq**

tapper length,L: **100mm**

Power of machine: **5HP**

Speed: **750 rpm**

time, **t** = ???

ive once try to determine the force exist by **P=F/A:**

then once i get the **F**, ive determine the work done which is **W=F x S;**

lastly ive tried to find the time,**t** by using **P= W/t** which is **P** is a power of machine while **W **is a work done

but im not satisfied with the answer that i got,

can anybody correct me if im wrong or giving me for some tips or correct formulae on how to done it

i would be greatly thanks

regards

noob