Solving Box Pulling Problem: Accelerating Comics to Stuart's Store

[Evan Johnson]

Homework Statement

Sheldon moves a box of comic books to stuarts comic book store by attaching a rope to the box and pulling with a force of 90 N at an angle of 30. The box of comic books has a mass of 20 kg and the coefficient of kinetic friction between the bottom of the box and the sidewalk is .5. Find the acceleration of the box

Homework Equations

F=ma

The Attempt at a Solution

i know the answer is A=.12 m/s^2 but i have no idea how to get to that answer, please explain!

 

[phinds]

Draw the force vectors. You have not even started to solve such a problem until you have drawn the force vectors.

 

[Evan Johnson]

i did i drew a fbd

 

[Evan Johnson]

and i think its Facos(30) for x-axis and Fasin(30) for y axis

 

[phinds]

I say again, draw the force vector diagram (and show it here).

 

[Evan Johnson]

I actually just figured it out! :) but thanks for your help anyways!