The current theory of the srtucture of the Earth, called pate tectonics , tells us that the continents are in constant motion. Assume that the North American continent can be reoresented by a slab of rock 5450 km on a side and 36 km deep and that the rock has an average mass density of 2790 kg/m^3. The continent in moving at the rate of about 3.2 cm/year. Part 1) What is the mass of the continent? Answer in untis of kg. Part 2) What is the kenetic energy of the continent? Answer in units of J. Part 3) A jogger (of a mass 79 kg) has the same kenetic energy as that of the continent. What would hos speed be? Answer in units of m/s.

"i have always loved contemporary art and made it a general goal to work within the field. after a few nonprofit internships at museums and galleries, i decided to try the for-profit art world and was offered a job as the ad assistant at the magazine. i much prefer the pace of the for-profit art community and have stayed with the company for three years, with a promotion to an account manager last spring."

i just did this and got a 100.

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.