1. Which of the following are liquid propellants?
Ammonium Perchloride
Potassium Nitrate
None of the above

2. Name one disadvantage of solid propellants
They are powerful
They are cheap to make
They cannot be turned off once started
They are unstable and can explode
All of the above

3. The force that pushes a rocket upwards is known as
Air resistance

4. A rocket stability can be controlled by changing
the rocket motors
the weight of the rocket
the diameter of the rocket
the amount of fuel used
the length and the fins

5. Aerobraking is the name given to
using the atmosphere to slow down the descent of the capsule
applying the rocket's brakes while in the air
the heat shield
the destruction of the rocket in the air
a rocket's fins