Physics 3 part question. you will get 40 points. PLEASE HELP ME IM DESPERATE

Alow cost, low earth orbit (leo) satellite is to be fabricated at a university, for subsequent launch by rocket. what are the constraints and objectives for selection of a material suitable for the satellite bus (i.e. the structure)? explain each in brief. (15 marks) b)suggest sources of data which could support the selection of materials for applications in space. (5 marks) c) set weights for the objectives listed in (2a) using the digital logic method. (5 marks)

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this