Advertisements
Advertisements
Question
Rocket works on the principle of conservation of
Options
mass
energy
momentum
velocity
Solution
momentum
Explanation:
Rocket works on the principle of conservation of momentum.
APPEARS IN
RELATED QUESTIONS
A ball is hanging by string from the ceiling of the roof. Draw a neat labelled diagram showing the forces acting on the ball and the string.
State one factor on which the magnitude of a non-contact force depends. How does it depend on the factor stated by you?
Give one example in each of the following cases where a force:
(i) Stops a moving body.
(ii) Moves a stationary body.
(iii) Changes the size of a body.
(iv) Changes the shape of a body.
A ball moving on a table top eventually stops. Explain the reason .
A car initially at rest, picks up a velocity of 72 kmh−1 in 20 seconds. If the mass of the car is 1000 kg, find
- Force developed by its engine
- Distance covered by the car.
A golfer hits a ball at rest, such that the contact between the ball and golf stick is for 0.1 s. If the golf ball covers a linear distance of 400 m in 2 s, find the magnitude of force applied. Mass of golf ball is 50 g.
A car of mass 1000 kg develops a force of 500 N over a distance of 49 m. If initially, the car is at rest find
- Final velocity
- time for which it accelerates.
While sieving grains, small pieces fall down. Which force pulls them down?
A gas filled balloon moves up. Is the upward force acting on it larger or smaller than the force of gravity?
A man is pushing a cart down a slope. Suddenly the cart starts moving faster and he wants to sloyy it down. What should he do?
