1. Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere. Earth's oceans, because of their high heat capacity, can absorb heat and therefore act to slow down global warming. How much heat would be required to warm Earth's oceans by 1.0 °C? Assume that the volume of Earth's oceans is 137 * 10^7 km3 and that the density of seawater is 1.03 g/cm^3. Also assume that the heat capacity of seawater is the same as that of water.
2. Neutron stars are believed to be composed of solid nuclear matter, primarily neutrons.
a) If the radius of a neutron is 1.0 x 10^-13cm, calculate the density of a neutron in g/cm^3. (volume of a sphere = 4/3pr3)
b) Assuming that a neutron star has the same density as a neutron, calculate the mass in kilograms of a small piece of a neutron star the size of a spherical pebble with a radius of 0.10 mm.
3. A NASA satellite showed that in 2003 the ozone hole was much larger than it was in 2002. The 2003 hole measured 1.04 * 10^7 mi^2 in diameter, while the diameter of the 2002 hole was 6.9 * 10^6 mi^2. Calculate the difference in size between the two holes in square meters.