Define reflection and give to examples define refraction and give two examples

Why is Earth a troubled planet? A. because the Dark Thing came to Earth many years ago. B. because Earth has too many people fighting the Dark Thing C. because people on Earth don't know how to think for themselves D. because there is evil on Earth

Describe what happens to the average kinetic energy of water molecules as water freezes.

Gravity is a force of attraction between objects that is due to their weight and height between one another. a. True b. False

During fuel burn, the vertically launched terrier-sandhawk rocket had an acceleration of 300 m/s2 (about 30 times free-fall acceleration called 30 g). the fuel burned for 8.0 s. find the height of the terrier-sandhawk rocket at the end of fuel burn.

Calculate the speed of a proton having a kinetic energy of 0.995 * 10-19 J and a mass of 1.673 * 10-27 kg. Answer in units of m/s.

What is ___ heating of a liquid__ gas to liquid

A gate in an irrigation canal is constructed in the form of a trapezoid 2 m wide at the bottom, 38 m wide at the top, and 2 m high. It is placed vertically in the canal so that the water just covers the gate.

A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine

Why do you float in space

How does physical change affect the identity of a substance