# Recent content by Charanjit

1. ### When can one Change order of derivatives?

Hmm...ok never knew that. Thanks.
2. ### When can one Change order of derivatives?

Here is an example... d/dz(dp/dx) = d/dx(dp/dz) I dont remember learning this in my calculus or differential equations classes unless it was called something else.
3. ### Weight before/after change in rotation Speed

Yes, I understand that F=ma = 0 since the person will not move. Now the three terms that come into play... would the centrifugal force help at all since the earth is rotating?
4. ### Weight before/after change in rotation Speed

Homework Statement How would the weight of a person in some place (48 North and 123 West) change if the rotation rate increased so a day was 3 hours long? Homework Equations F=ma The Attempt at a Solution The above is not the only equation I think that is needed for this. Not...
5. ### Finding volume of swimming pool

Homework Statement A swimming pool is circular with a 40-ft. diameter. The depth is constant along east-west lines and increases linearly from 2 ft.at the south end to 7 ft. at the north end. Find the volume of water in the pool. Homework Equations Dont know how to enter integrals...
6. ### Double Integrals Limits of Integration

Hmm.. I see. Thanks alot. With the functions that arise in double integrals, how to know if the function is even?
7. ### Double Integrals Limits of Integration

I am just starting to do double integrals and came acorss an issue. I remembered from single integrals when we integrate from limits for say -1 to 1, we can double it and change integration limits to 0 to 1. Now, when is this the case? Basically, when can we not do this?
8. ### Rearranging an equation

1. Homework Statement This is a science equation, just having trouble rearranging to solve for a variable. The equation is below. Basically I want the equation to be in the form of delta T = T2-T1 = ... 2. Homework Equations (-R/L)[ln(p2/p1)] = [(1/T2)-(1/T1)] 3. The...
9. ### Finding a relationship using 1st Law of Thermodynamics

After posting this, I found something, why not divide both sides by T, that will give us the relationship the question wanted right?
10. ### Finding a relationship using 1st Law of Thermodynamics

1. Homework Statement Derive a relationship between dq/T , dT/T, dp/p , Cp , and R for an ideal gas. 2. Homework Equations dQ = dU + dW and/or dq = du + dw (for a unit mass) p*d(alpha) = dw (alpha = specific volume V/m) du = Cv*dT p(alpha) = RT (Ideal gas equation, a different...