3

 

ҳ m=120 (.3.1). ϳ 䳺 F, , h=10 . F 䳿 η, f=0,2.

 

 

1. F: G; Rf ; Rn.

 

2. F W= Fhcosa, F.

 

3. :

 

 

ֳ , Rf ;

Rf =fRn, Rn = Fsina

Rf =fFsina. ' F

:

 

4. ϳ F , :

 

:

 

. 3.1

 

 

5. 䳿 .

η = W/W,

 

W = W;

WK , h;

 

W = Gh = mgh = 120∙9,81∙10 = 11772 = 11,772 .

 

, η = Wk/W =11772/13308 = 0,885.

 

 

³: W = 13,308 , η = 0,885.

 

 

 

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