Help with 4 physics homework problems

[Nguyenfa.t]

Homework Statement

i scanned the 4 problems i need help on. if you can help it would be greatly appreciated. Thanks in advance guys!

Homework Equations

The Attempt at a Solution

 

[Hootenanny]

We will gladly help you out, once you have provided an attempted solution.

 

[andrevdh]

Problem 1:

Can you apply Newton's second law to the forces (components) along the incline for the 4 kg masspiece?

What forces acts on it and in which direction?