A chemical symbol is to an element as chemical formula is to ?

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)

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

Need in all of themmm only answer if you know plsssss