Advertisements
Advertisements
प्रश्न
Is the following statement true or false :
A rocket can propel itself in a vacuum.
Advertisements
उत्तर
The given statement is true. A rocket propulsion system works on the principle of conservation of momentum.
APPEARS IN
संबंधित प्रश्न
A stone of 1 kg is thrown with a velocity of 20 m s−1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?
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?
What is the force which produces an acceleration of 1 m /s2 in a body of mass 1 kg ?
Why is it difficult to walk on a slippery road ?
Explain why, a runner presses the ground with his feet before he starts his run.
Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hose pipe tends to go backward.
Give a scientific reason.
Even though the magnitudes of action force and reaction forces are equal and their directions are opposite, their effects do not get cancelled.
Why do the action and reaction forces in a pair not cancel each other out?
In a hose pipe ejecting water, what is the reaction force?
What is the main characteristic of action and reaction forces?
