Help! I'm Behind on a Physics Homework Assignment!

[whizbang21]

I've been out 8 days and i missed this entire chapter, with a test on monday so I am trying to get all caught up. but i don't know how to do any of this homework.

Homework Statement

the mass is 3.80 kg, T = 16 N, and = 35 degrees. The surface has no friction. If x is horizontal and y is vertical...

i found tx=13.1 ty=9.2 and normal force=28 but i don't know if that has anything to do with what I am trying to find out..

what is the net force of the block in the x direction, and in the y direction. the acceleration of the block. What will be the position of the block after 12 seconds if it starts from a position 3 m from the left of the origin at a speed of -5 m/sec right? and what will be the velocity of the block at this time?

Homework Equations

no clue or else i would have figured it out myself.

The Attempt at a Solution

 

[Doc Al]

i found tx=13.1 ty=9.2 and normal force=28 but i don't know if that has anything to do with what I am trying to find out..

Good. That has plenty to do with answering this problem.

what is the net force of the block in the x direction, and in the y direction.

Start here. What forces act on the block? What are the components? (You've already solved most of this.) Add them up to get the net force. Give it a shot.

 

[whizbang21]

i found net-x but net-y I am having trouble with, I've tried adding the ty and the normal force together and also subtracting them, it didn't work of course but I am not sure if I am doing it wrong or I am getting screwed by significant figures. I am kind of just stumbling around like a blind man as this is the first problem I've done this entire chapter and i haven't received any help from my teacher.

 

[Doc Al]

The net force in the y-direction should be easy to answer without any calculation. Hint: You used it to figure out the normal force, whether you realized it or not. (There are three forces contributing to the net force.)

 

[whizbang21]

your cryptic answers would probably be helpful if i had a textbook and at least 1 day in class, rather than learning everything from google and trial and error.

 

[Doc Al]

your cryptic answers would probably be helpful if i had a textbook and at least 1 day in class, rather than learning everything from google and trial and error.

You figured out the normal force somehow. How did you do it?

 

[whizbang21]

google.