# Homework Help: Calculating the tension attached to a ball attached to coaster rolling down incline

1. Mar 3, 2009

### yoyolala

1. The problem statement, all variables and given/known data

Ball has a mass of 0.10 kg
the car is at point D moving down a 30 degree incline with an acceleration of 5.0 m/s^2

http://img10.imageshack.us/img10/6526/fullscreencapture322009.jpg [Broken]

(D in picture)

calculate the horizontal component of the tension in the string in newtons

calculate the vertical component of the tension in the string in newtons

2. Relevant equations

F=ma

I don't think my FBD are right... but maybe

T vertical = (ma+mg)/(costheta)

3. The attempt at a solution

I drew a FBD
and I know the answers but don't know how to get them

The horizontal component of the Tension = 0.43 N
The vertical component of the Tension = 0.75

The angle theta used is not going to be the same as the angle of the incline, correct?
How do you determine that angle

Last edited by a moderator: May 4, 2017