# Search results

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...

12. ### Molar Specific Heat

This is a qualitative question not quantitative. But for some equations that do go with this are the following: Delta(E)=Q-W --First law of Thermodynamics
13. ### Molar Specific Heat

1. Homework Statement What si the difference between the molar specific heat at constant volume and at constant pressure? Homework Equations The Attempt at a Solution
14. ### Gravity Ratio

Wow, its a tough one. I got it solved. Thanks anyways.

Yes, meters.
16. ### Gravity Ratio

1. Homework Statement : The center of a 1.00 km diameter spherical pocket of oil is 1.20 km beneath the Earth's surface. Estimate by what percentage g directly above the pocket of oil would differ from the expected value of g for a uniform Earth? Assume the density of oil is 8.0*10^2 (kg/m^3)...
17. ### Gravity Problem

I got it solved. Thanks.
18. ### Gravity Problem

So is R the radius of the earth? So GMm cancel and all we are left with is 0.925, R2 and r. Solve for r?
19. ### Gravity Problem

1. Homework Statement : It can be shown that for a uniform sphere the force of gravity at a point inside the sphere depends only on the mass closer to the center than that point. The net force of gravity due to points outside the radius of the point cancels. Question: How far would you have...
20. ### Current Carry Wire With A Loop

Ahh ok. I got it. Thanks.
21. ### Current Carry Wire With A Loop

Ok, but in which equation? E=BLv?
22. ### Current Carry Wire With A Loop

Ok... so how do I import that into the equation? We don't have the "time" variable.
23. ### Current Carry Wire With A Loop

Which b are you talking about? The equation E=BLv? That "B" is the magnetic field.
24. ### Current Carry Wire With A Loop

Well yes, but how to relate velocity?
25. ### Current Carry Wire With A Loop

1. Homework Statement : A. Determine the magnetic flux through a square loop of side a (see the figure) if one side is parallel to, and a distance b from, a straight wire that carries a current I. Express your answer in terms of the variables I, a, b, and appropriate constants. Answer...

Hello?
27. ### Shrinking Loop

Anyone help on this?
28. ### Shrinking Loop

1. Homework Statement : A circular loop of flexible iron wire has an initial circumference of 166cm , but its circumference is decreasing at a constant rate of 13.0cm/s due to a tangential pull on the wire. The loop is in a constant uniform magnetic field of magnitude 1.00 T, which is oriented...
29. ### Magnetism (Current-Carrying Wires)

Thank you. :)
30. ### Magnetism (Current-Carrying Wires)

So what I have is correct? Can you check?