It requires 2.500 joules to raise a certain amount of water
(c = 4.186 jlg°c) from 20.0°c to 60.0°c.

what is the mass of the water that is being heated?
o 159
o 409
o 639
o 809

Explanation:

The heat absorbed from the heating of water can be calculated by the product of the mass of the sample, specific heat and the difference in temperature. From the given data, we can simply calculate the mass of the sample as follows:

H = mC(T2-T1)

2500 = m(4.186)(60-20)

m = 14.93 g

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

snell's law

refractve index = sin incidence / sin refraction