PLEASE HELP!! If you use a screwdriver to pry the lid off a paint can, which class of lever is the screwdriver? How does the screwdriver change the force that is applied to it? What is its ideal mechanical advantage?

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Explain what happens at the saturation point when adding salt to water at room temperature.

If a negatively charged particle is placed at rest in an electric potential field that increases in the positive x-direction, what will the particle do? a. accelerate in the positive x-direction b. remain at rest c. accelerate in the negative x-direction