Which symbol represents a type of radiation that has the same mass as an electron and a positive charge?
A. Pe
O B. He
c. De
OD. or

Help please

An apple is falling from a tree. disregarding air resistance, which diagram shows the free-body diagram of the force or forces acting on the apple?

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)

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.