Suppose that you measure a galaxy's redshift, and from the redshift you determine that its recession velocity is 30,000 (3×104 kilometers per second. according to hubble's law, approximately how far away is the galaxy?

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Sodium chloride, nacl, is formed when a sodium atom transfers its electron to a chlorine atom. the difference in charge between the two atoms creates a(n) attraction that bonds them together.

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm