Question
Rocket works on the principle of which one of the
following?Solution
A rocket works on the principle of momentum conservation. According to Newton's third law of motion, every action has an equal and opposite reaction. In the context of rockets, when the rocket engine expels propellant gases out the back at high speed (action), the rocket itself is pushed forward (reaction). This is the conservation of momentum: the momentum lost by the gases being ejected backward is gained by the rocket moving forward.
Find the number of ways to arrange each letter of the word 'EDUCATIONAL' such that all the vowels always come together.
Find the no. of words formed by using all the letter of the word DISCOUNT, so that the vowels are never together?
How many 4-digit numbers can be formed using digits 1–9 if repetition is not allowed and the number is even?
In a party 19 persons shake hands with every other person. Find the total no of handshakes in the party?
How many numbers of five digits may be formed with the digits 7, 2, 0, 0, and 1?
How many 4-digit even numbers can be formed using digits 1, 2, 3, 4, 5, 6 without repetition?
In how ways can the selection be made so that a particular member is always included?
...- In how many ways can you arrange 3 identical cubes, 2 identical pens, and 1 ball such that all 3 cubes are not together?
From 6 officers and 8 Jawans, in how many ways can 5 be chosen to include exactly 3 officers?
How many five digit numbers can be formed using the digits 0, 1, 2, 3, 4 and 5 which are divisible by 5, without repeating the digits?
