Why energy must be added to a solid to cause it to melt.

Which single force acts on an object in free fall? A. Air resistance B. gravity C. Friction D. fluid forces

If a 0.20 kg object fell 7.0 Meters before it hitting the ground, what was it's change in Potential Energy during the fall?

What happens to the speed of water waves as it enters a shallow medium.

Which of the following is a change of state of a substance? A. Water placed in the freezer forms ice cubes. B. A piece of metal becomes warm in sunlight. C. A large piece of paper is cut into eight strips. D.

What distinguishes an independent variable from the dependent variable

Do you think Pluto should be considered a planet? Why or why not?

An object starts from rest at time t = 0.00 s and moves in the + x direction with constant acceleration. The object travels 14.0 m from time t = 1.00 s to time t = 2.00 s. What is the acceleration of the object? a) 5.20 m/s^2 b) 10.4 m/s^2 c) 8.

A box is dragged without acceleration in a straight-line path across a level surface by a force of 13 N. What is the frictional force between the box and the surface?

What is a wormhole, and how is it formed?

Most cells cannot harness heat to perform work because