Please solve the calculation

[ranto]

Kindly solve the problem as per meow manual calc

[-MFra-]

Hi Robert,

if  P*RL = 1129 psi * in, even QL must have the same units. The algebraic csum  is made between homogeneous quantities.

Bye

[Fred_Kohlhepp]

psi*in = lbf/in

[-MFra-]

I agree completely. But the applicant has considered the mass and not the strength.

[Fred_Kohlhepp]

Since his example is dividing units out, and since if you correct lb to lbf the equation is unit consistant, I assumed that the omission was due to confusion on the part of a new Mathcad user.  At any rate, you defined Q as "psi in,"  I defined it as "lbf/in," and these are equivalent.

We'll have to wait for his clarification.  😉

[ranto]

Dear Sir,

Thank your for your immediate reply

But still now i didn't get the answer

Q as lb/in only not lbf/in

as i mentioned the value is correct.

[-MFra-]

by this I mean that P*RL and QL must be lbf / in.

[Fred_Kohlhepp]

Well, not quite

[ranto]

Dear Sir,

Thank you for your immediate reply.

However still now i didn't get the correct answer.

[Fred_Kohlhepp]

Robert;

You're getting confused by the way Mathcad handles units.

There is a difference between lb and lbf; lb is a mass unit (like slugs and kilograms.)  lbf is a force (like Newtons.)  Your equations need to be unit balanced if they're correct.  Now, you define Q as two terms, the first term has defined units:

So Q has units of lbf/in.

When you write lbs/in of circumference, you're specifying force per unit length.  To Mathcad, that's lbf/in, or N/m, or . . .

[ranto]

‌Dear Sir,

Thank your for your reply

However i will check the units

[Fred_Kohlhepp]

My solution attached

[ranto]

Thank you boss