# Homework Help: Centripetal force. Radius is not given. Find tension in each support

1. Mar 18, 2013

### osman ibn ali

There is this problem that I have been trying to do but I just cannot understand how to approach it. I have been doing centripetal problems for hours so maybe I am just tired.
The thing is that I do not see an equation I can use to cancel out radius since the radius is not given.
I have uploaded a file containing a diagram
Help would be aprreciated. THANKS.

."In an amusement park ride a motor rotates two platforms with a period of 4.0 s in a vertical circle. The mass of platform 1 is 1200 kg and 2000 kg for platform 2. Find the tension in each support when the platforms are at the bottom as shown."
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

#### Attached Files:

• ###### centripetal problem.docx
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2. Mar 19, 2013

### haruspex

When I open the doc I see text but no diagram. Can you describe it in words?

3. Mar 19, 2013

### osman ibn ali

l
l Support A is 4.0m
l
------- Platform 1 is 800 kg
l
l
l Support B 3.0 m
l
l
--------- Platform 2 is 1000kg

4. Mar 19, 2013

### osman ibn ali

A kind of visual diagram with the strings and platforms is shown above.

5. Mar 19, 2013

### SammyS

Staff Emeritus
Information is given that gives the two radii.

The circle each rotates in is in a vertical plane.