What is s the best description of the constructive interference of light? a. two waves have the same direction of displacement. b. two waves have displacement in opposite directions. c. a longitudinal wave meets a transverse light waved. a mechanical wave meets an electromagnetic wave.

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)

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?