Advertisements
Advertisements
प्रश्न
Explain how a rocket works.
Advertisements
उत्तर
The hot gases, produced by the rapid burning of the fuel, rush out of a jet at the bottom of the rocket at a very high speed. The equal and opposite reaction force of the downward going gases pushes the rocket upwards. A rocket can propel itself even in vacuum because it does not require air for obtaining uplift or for burning its fuel.
APPEARS IN
संबंधित प्रश्न
Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet?
Is the following statement true or false :
A rocket can propel itself in a vacuum.
If action is always equal to reaction, explain why a cart pulled by a horse can be moved.
Do action and reaction act on the same body or different bodies ? How are they related in magnitude and direction ? Are they simultaneous or not ?
If a man jumps out from a boat, the boat moves backwards. Why ?
Draw a diagram to show how a rocket engine provides a force to move the rocket upwards. Label the diagram appropriately.
Give scientific reasons.
It is easier to stop a tennis ball as compared to a cricket ball when both are travelling with the same velocity.
While catching a cricket ball the fielder lowers his hands backwards. Why?
“Wearing helmet and fastening the seat belt is highly recommended for safe journey” Justify your answer using Newton’s laws of motion.
In a hose pipe ejecting water, what is the reaction force?
