Tina wants to install one unit that both heats and cools. Which should Tina install?

How did Thomson know atoms had an overall neutral charge? He knew there were negative electrons but he came to the conclusion that the rest of the atom was positively charged, why was this? How did he know it would be positively charged?

2. Sublimation is the process of changing of liquid to solid.

A 40-kilogram crate is at rest on a level surface. If the coefficient of static friction between the crate and the surface is 0.69, what horizontal force is required to get the crate moving?

Which elements is found in nature only in compounds

Consider a sphere of radius r, surface area a and volume v. suppose you double the radius to 2r. how does the new surface area anew and the new volume vnew compare to the old values?

Determine the magnitude of the effective value of g⃗ at a latitude of 60 ∘ on the earth. assume the earth is a rotating sphere.

What characteristic of a planet determines the acceleration due to gravity on it?

Which set of terms best defines what affects kinetic energy and potential energy, respectively? position, gravity gravity, position velocity, height height, velocity

You are operating a powerboat at night. You see green and white lights on another boat. What should you do?

How does Newton's second law apply to an "Egg Drop" experiment?