What happens after a thruster is fired to push a spacecraft a. the spaceship will not move due to air resistance b. the spaceship will not move because it only works on earth c. the spaceship will move and will not stop until it is stopped by an equal and opposite force d. the spaceship will move and then slowly come to a stop on its own

The thruster releases small amounts of substance (in the form of a gas or liquid) at very high speed out of the nozzle. Since Newtons  3rd law states that each action has an equal and opposite reaction, therefore spacecraft should also experience a push in the opposite direction. Therefore the spaceship will move. This will only stop when it faces an equal opposite force.

 

c. the spaceship will move and will not stop until it is stopped by an equal and opposite forced

Independent variable is something that is changed in a experiment. 

The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips.