Aspherical acom squash of radius, r, and initially at temperature t, is placed in a miltuwivu u which generates a uniform source of energy within the squash of (m)v. neglecting radial temperature gradients, derive an equation for the temperature of the squash as a function of time if energy is also lost at the surface of the squash at a rate h(t-t.)4tr", (e/t) where t is the temperature in the microwave cavity. assume all properties are constant.

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.