It is possible to derive the age of the universe given the value of the hubble constant and the distance to a galaxy, again with the assumption that the value of the hubble constant has not changed since the big bang. consider a galaxy at a distance of 400 million light-years receding from us at a velocity, v. if the hubble constant is 20 km/s per million light-years, what is its velocity? how long ago was that galaxy right next door to our own galaxy if it has always been receding at its present rate? express your answer in years. since the universe began when all galaxies were very close together, this number is a rough estimate for the age of the universe.

What are the applications of electromagnetic waves

The intensity of a polarized electromagnetic wave is 12 w/m^2. part a) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=0∘ with the plane of polarization? part b) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=30∘ with the plane of polarization? part c) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=45∘ with the plane of polarization? part d) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=60∘ with the plane of polarization? part e) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=90∘ with the plane of polarization?

Asatellite component is in the shape of a cube with 10cm edges, has an evenly distributed mass of 2 kg and one bolt hole at each of four corners. if the maximum predicted random vibration environment is 10 grms, what bolt size would be a good choice for restraint? what other factors might drive bolt size besides force/stress?