A singer moves a note down one octave ... How has the sound changed?

The waves created by two speed boats in a lake interact to form larger waves. This is an example of: A. constructive interference. B. destructive interference. C. absorption D. transmission

The auroras occur in the a. troposphere c. mesophere b. stratosphere d. ionosphere

You heat a mug of water to make hot chocolate. Which statement best describes the changes in the water? A. The kinetic energy of the particles increases as the temperature increases. B.

A toy gun uses a spring to project a 6.4 g soft rubber sphere horizontally. The spring constant is 9.0 N/m, the barrel of the gun is 12.4 cm long, and a constant frictional force of 0.028 N exists between barrel and projectile.

Is there any relation between distance and the colors we see?

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.