Struggling with Homework? Get Help with These 4 Problems

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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

 

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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?