Explain the qualifications that must be met for any vehicle to go in space

How is the gravitational force related to the distance between two objects?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter