Brass is an alloy made from copper and zinc. a 0.59 kg brass sample at 90.0 c is dropped into 2.80 kg of water at 5.0 c. if the equilibrium temperature is 6.8c, what is the specific heat capacity of brass?

With i really need the correct answer!

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?