Rocket Propulsion

Rocket Propulsion

The rocket propulsion theory is based on newton's third law i.e every action has equal and opposite reaction. Rocket is filled with propellant, combustion takes place inside rocket and comes out at very high pressure from the bottom of the rocket which pushes the air downwards and according to newton's law the thrust is created which pushes the rocket upward.

Demonstration

To demonstrate rocket propulsion we create a balloon rocket. 

Materials required

• Balloon
• straw
• thread
• tape 

Steps of the experiment

• We tie the straw on a thread connected tightly from both ends.
• Stick the balloon with the straw with tape.
• Fill the balloon and hold the air inside and pull the straw in one end of the thread and release the air as shown below.

Layers of earth

Layers of earth

 

Our earth contains three different layers which are concentric in nature i.e. all have the same center. Earth's radius is 6371 km with weight 5.972 X 10^24. The density of the earth keeps on increasing as we go towards center and one of the obvious reason is very pressure.

CRUST

Crust is the outer layer of the earth which is mostly mad up of soil rocks and contains water. Crust ranges from 5-70km. The crust mostly contains the different types of rocks like igneous, basalt, silica etc.

MANTLE

Mantle is the inner layer to the earth and ranges up to 2890KM. Mantle is compost mostly of silicate and is mostly in molten form. Since these molten parts move due to earth's rotation and in case if find any obstacle the force gets distributed and causes earthquakes. Mantle is subdivided into lower and upper mantle. Upper mantle is after the crust and lower mantle is before the core.

CORE

Core is the innermost layer is again subdivided into outer core and inner core. Earth's magnetic field is due to core and core is mostly metallic.