p, 



- (-- I 



fore Jr-TF' + 4- ...... - (2" - 1) 7*4 (2- 1 - I)*, 



,-,-,-.. 



' + 2'-*+ ...... + 2- (* - 



1G5. The fifth Mechanical Power is the Inclined Plane. 



'ic we mean a plane inclined to the 

 horizon. A weight 1C maj be supported on an inclined 

 plane by a power P less than 



To find the ratio of the power and vdght in the 



AB be the inclined pl.t 

 angle wl the 



horizon. Let the power P act on 



:t in tK 

 making an angle e with the ]>' 



1 at 



in CP, I leal 



/, at 



resolve 



forces perpendicular and par* 

 nllcl to the plane, we bare B 



'.ic- H'cosa-i' ..(1), 



Pcoet- irsina-' (2). 



The second equation gives the required relation - - T , - - - ; 



and the first equation gives tbe ma {" the pressure & 



act horizontally, - - o, ana P- TTtan a. 



