Question

Ajutor va rog , Problema imi trebuie , m am blocat nu știu cum sa aflu

Answer 1

Vectorial: F+N+G+Ff=0

Scalar:Ox:Fcosα-Ff=0=>Fcosα=Ff=>Ff=200*0,8=160 N

           Oy:N+Fsinα-mg=0=>N=mg-Fsinα

sin²α+cos²α=1<=>sin²α=1-0,64=0,36=>sinα=√0,36=0,6

N=mg-Fsinα=50*10-200*0,6=500-120=380 N

Ff=μN=>μ=Ff/N=160/380=0,42

d=v*t=1*60=60 m

L_Ff=-μmgd=-0,42*50*10*60=-12600 J

L_F=F*d=200*60=12000 J

P=L/t=F*d/t=12000/60=200 W