I have a single plank of wood that is 6 meters long, and a rock I can use as a fulcrum. I make a lever with a mechanical advantage of 2.

a) I place an 80N bottle on the output end of this lever. With how much force will I have to push on the input end in order to lift this bottle?

b) Draw and label a diagram that shows this lever. Label the input and output arms, as well as the fulcrum. Draw the 80N bottle on the output arm.

Which is not true about oxygen-17 and oxygen-18?

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !