Jezi

I was wondering if anyone knew of a college somewhere offering a differential equations class this summer online? Preferably somewhere that other colleges would accept their credit, i go to WSU. Any help would be great!

You need to melt a 0.50 kg block of ice at -10degrees C in a hurry. The stove isn't working, but you do have a 40 V battery. It occurs to you that you could build a capacitor from a couple of pieces of sheet metal that are nearby, charge the capacitor with the battery, then discharge it through the block of ice. If you use square sheets spaced 1.5 mm apart, what must the dimensions of the sheets be to accomplish your goal?

If you could explain how you got to your answer that would be fantastic! Really need some help on this one. :)

Thanks in advance.

A thin spherical shell of radius R has total charge Q.

What is the electric potential at the center of the shell?

Express your answer in terms of Q, R, and appropriate constants.

You carefully weigh out 11.00g CaCO_3 of powder and add it to 44.55g HCL of solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 51.04 . The relevant equation is

CaCO_3(s)+2HCL(aq) ->H_2O(l)+CO_2(g)+CaCl_2(aq)

Assuming no other reactions take place, what mass of CO_2 was produced in this reaction?

An 11 kg bowling ball at 0 degrees Celsius is dropped into a tub containing a mixture of ice and water. A short time later, when a new equilibrium has been established, there are 5.0 g less ice.

From what height was the ball dropped? Assume that no water or ice splashes out.

A large 3.00×10^4 L aquarium is supported by four wood posts (Douglas fir) at the corners. Each post has a square 5.10 cm x 5.10 cm cross section and is 90.0 cm tall.

By how much is each post compressed by the weight of the aquarium?

In millimeters.

-------------------------------

I have no idea how to do this. I'm not asking for just an answer necessarily (though I'd take that too), but if you could lead me through to the answer, that would be fantastic!

Thanks!