if a star 100 light years from earth is beginning to expand into a giant star how long will it take for astronomers to observe this development explain

Ways to stop pollution

What strategy can you use to keep track of the interior and exterior angles of the triangle?

If two protons and two neutrons are removed from the nucleus of an oxygen atom, a nucleus of which element remains?

What is Kinetic Molecular Theory? Explain.

Explain each Mechanical weathering: Chemical weathering:

It is difficult to lift a heavy stone than the lighter one on the earth, why?

The vapor pressure of ethanol at 25 degrees C is 7.83 kPa. Calculate the vapor pressure in atm. Round answer to 3 significant digits.

According to Newton's second law of motion acceleration or an object depends upon the ___ of the object and the ___ Acting on it. I'm confused on what the blanks are. I can't find them.

What is the concentration of H + ions at a pH = 7?

Suppose that Paul D. Trigger fires a bullet from a gun. Will the speed of the bullet leaving the muzzle will be the same as the speed of the recoiling gun? Explain.