For two variables in a direct proportion, what is the result of doubling one variable?

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

What is the coefficient of kinetic friction μk between the block and the tabletop?

3. a lunar exploration vehicle was created by a research team. it weighs 3,000 kg on the earth. it needs an acceleration of 10 m/s2 on the moon. in order to have the same acceleration, what will be the net force acting on the vehicle on the earth?