What is the acceleration on a body that approached the earth and comes within 6 earth radii of the earth’s surface?

Order the sequence of ideas that lead to marie curies discovery of radioactive elements number the events in chronological order starting with the oldest

Does anyone know how to solve this problem? i really need . i made an attempt but i just cant get it. a metal rod is 25.000 cm long at 25.0 degrees celsius. when heated to 102.0 degrees celsius, it is 25.054 cm long. what is the coefficient of linear expansion for this metal.

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?