Uranium-235=710million The age of Earth was first established in 1953 when Claire C. Patterson of the California Institute of
Technology used a uranium-lead clock to analyze rock. In comparing amounts of uranium-235 with lead-207,
he established that about 8 half-lives of uranium-207 had passed since the rock formed. Using this data,
estimate the age of Earth.
710 m x 8 =

Ireally just need to get finished with precal! i’m really sorry i have to do this! hope this !

The big glowy thing is called the sun it is a star in our galaxy and is over 1 million degrees

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.