# Force in pipe

1. Jan 25, 2016

### werson tan

1. The problem statement, all variables and given/known data
why for the force along the x -axis , the velocity is 12 cos 60 -12 ? why not 12cos60 12 , since they are in the same direction

2. Relevant equations

3. The attempt at a solution

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2. Jan 25, 2016

### Suraj M

Since what are in the same direction?

3. Jan 25, 2016

### werson tan

as wecan see , they are moving to the right

4. Jan 25, 2016

### Suraj M

There are 3 there
Please specify what you mean by “they”

5. Jan 25, 2016

### werson tan

velocity along the x direction . (circled part)

6. Jan 25, 2016

### Suraj M

That's not what I meant
I meant which force the one due to outflow through A or B or the inflow. Of the 3 which 2 are you referring to?

7. Jan 25, 2016

### werson tan

I wanna ask A and the inlet first

8. Jan 25, 2016

### Suraj M

Then yes the pseudo force(cos component) and the inlet would add up

9. Jan 25, 2016

### werson tan

so , the notes is wrong ? the velocity should add up ?

10. Jan 25, 2016

### Suraj M

I'm trying to get my head around the fact that they've taken force due to the inlet twice.

11. Jan 25, 2016

### werson tan

what do yo you mean ? we wanna find the resultant force , right ? So , the correct approach would be 12cos60 + 12 , right ? since they are both directed to the right

12. Jan 25, 2016

### Suraj M

I'm not an expert in this but I do agree with you.