In refraction, when a wave travels from one medium to another, it a) changes speeds.

b) always moves in the same direction.

c) stays in step.

d) travels in the opposite direction.

Explain how the theory of the Sun's dynamo results in an average 22-year solar activity cycle. Include the location and mechanism for the dynamo.

What do an electron and a neutron have in common? Each particle has a mass of 1 amu. Each particle exists inside an atom. Each particle has an electrical charge. Each particle is located in the nucleus.

Machining processes, such as lathe turning, drilling and milling, would be classified in what group of manufacturing processes?

if you have to apply 40 N of force on a crowbar to lift a rock that weighs 400 N, what is the actual mechanical advantage of the crowbar?

When you look out your window and see a skateboarder in front of your house and 2 min later you look out and see her several houses away you can use this information to describe her

How big is a wifi pulse signal coming from your router? A) 10 meters B) 15 meters C) 5-10 meters D) 20-30 meters

Imagine you are in a music concert. What different sounds might you hear? How are these sounds made?

Dose aloe Vera grow in the mesa?

A tradesman sharpens a knife by pushing it against the rim of a grindstone. The 35 cm diameter stone is spinning at 200 rpm and has a mass of 28 kg. The coefficient of kinetic friction between the knife and the stone is 0.20.

What is the unit for force we use when calculating F=ma?