When creating a satellite to orbit earth do engineer need to limit its mass to ensure orbit?

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

What is a good example of instantaneous speed

Acaterpillar tries to climb straight up a wall a meter high, but for every 2 cm up it climbs, it slides down 1 cm. eventually, it reaches the top. when it reaches the top, it does not pull itself over so it will slide down 1 cm. what is the total displacement traveled?