How o astronomers gather information to establish the hubble law?

Someone would tell me some important questions of physics?

The Earth is constantly spinning on its axis, like you might spin a basketball on your finger. It is this spinning of the Earth that causes

How can you make spherometer more sensitive

Why are electric motors used in circuits?

The acceleration due to gravity on planet a is one-sixth what it is on planet b, and the radius of the planet a is one-fourth that of planet b. the mass of planet a is what fraction of the mass of planet b?

What is the total momentum of the system after the collision

Compare the advantages and disadvantages of buying compact fluorescent bulbs rather than filament bulbs (6 marks)

Calculate the volume of this regular solid. A cylinder labeled B at the top, 13 centimeters high with a radius of 4 centimeters.

If your mass, the mass of Earth, and the mass of everything in the solar system were twice as much as it is now, yet everything stayed the same size, your weight on Earth woulda. quadruple. b. be the same. c. double. d. be eight times as much as now.

In what regions of the electromagnetic spectrum is the atmosphere transparent enough to allow observations from the ground?