A fan is a complex machine? True or false?

Why is raw sewage a major pollutant in some countries but not in developed countries?

Do changes in speed and mass have the same effect on the kinetic energy of an object? Explain.

What is the speed of a 0.145kg baseball if it's kinetic energy is 109 j

Find the difference in the pressure between the Dead Sea (400m below) and Amman (1000m above) the sea level. The density of the air = 1.29 kg/m3

A toy gun uses a spring to project a 4.5-g soft rubber sphere horizontally. The spring constant is 8.0 N/m, the barrel of the gun is 13 cm long, and a constant frictional force of 0.035 N exists between barrel and projectile.

If the volume of a container increases, then the pressure will: A. first increase and then decrease. B. increase. C. stay the same. D. decrease.

How does the theory of natural selection explain the diversity of life?

What law states that when matter undergoes a physical or chemical change, no atoms are created or destroyed?

Which statement would be a valid argument in favor of using nuclear power? There are few negative impacts from mining the fuel. Reactors are safe from natural disasters. There are little to no waste products from fission.

How would you convince somebody that the momentum of an isolated system is constant?