** a marathon runner completes a 42.238 km course in 2 h, 31 min, and 46 s . there is an uncertainty of 29 m in the distance run and an uncertainty of 3 s in the elapsed time. what is the percent uncertainty in the average speed?

scientific laws are the result of testing theories and proving them to be facts.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods