Physics
posted by MA .
What push parallel to a 42 incline is required to just start a 340 N block sliding up the plane? us = 0.6

x: 0 =Fm•g•sinαF(fr)
y: 0=Nm•g•cosα,
0 =Fm•g•sinαF(fr)= Fm•g•sinα μ•N=
=F  m•g•sinα μ•m•g•cosα.
F = m•g(sinα μ•cosα)=
= 340•(sin420.6•cos42)=...