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

Answer 1

x: 0 =F-m•g•sinα-F(fr)
y: 0=N-m•g•cosα,

0 =F-m•g•sinα-F(fr)= F-m•g•sinα- μ•N=
=F - m•g•sinα- μ•m•g•cosα.
F = m•g(sinα- μ•cosα)=
= 340•(sin42-0.6•cos42)=...