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?

Why do astronauts in the space shuttle weigh less?

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.

See the attachment and solve question 5th