7. A student had two metal spheres attached by a wire so that they hung next to each other, just touching. She raised the left sphere (Sphere X) to
the height shown below and released it so it would strike the right sphere
(Sphere Y) without friction or air resistance. How high will Sphere Y reach?
Point D
Sphere X
A
Point
Sphere Y
Point B
Point A

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?