Discovery Lab 16: Powering Earth: SES 141: Energy in Everyday Life

Discovery Lab 16: Powering Earth Due Apr 27 at 7pm Points 10 Questions 6 Time Limit None Allowed Attempts Unlimited Instructions Attempt History Attempt Time Score KEPT Attempt 3 less than 1 minute 10 out of 10 LATEST Attempt 3 less than 1 minute 10 out of 10 Attempt 2 6 minutes 3 out of 10 Attempt 1 4,832 minutes 2 out of 10 ! Correct answers are hidden. How much mass (in kilograms) radioactive material is need to power Earth’s interior over its lifetime? What fraction of Earth's mass is this? The flow of heat from Earth's interior to the surface is estimated to be 50 terawatt (1 terawatt = 1e12 joule/sec) and comes from two main sources in roughly equal amounts: the energy produced by the radioactive decay of isotopes, and the energy left over from the formation of the Earth. All numbers must be entered as 5000 or 5e3 or 5.0e3 and not with commas as in "5,000" and not as fractions as in "3/4" and not as percentages as in "70%".