1. It is observed that most of the galaxies in the universe are moving away from our system reference. The Sombrero Galaxy is emitting light with a wavelength
700 nm. a) If the galaxy is moving away with a speed of 90,000 km / s, what is the
perceived frequency on Earth? b) If the galaxy is approaching with a speed of
90000 What is the perceived frequency on Earth?

At what point the certain object feels zero garvitational force between earth and the moon. take the required information from the book.required: distance away from earth or moon

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)

Apossible explanation for a set of facts that can be tested by further investigation is called