Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: When an artificial satellite moves around the earth in a circular orbit with a constant speed, its velocity is not constant because the direction of motion of the satellite is changing continuously
Reason R: The force of gravity of earth keeps the satellite in circular orbit around it.
In the light of the above statements, choose the correct answer from the Options given below:
Options
ABoth A and R are true and R is the correct explanation of A
BBoth A and R are true but R is not the correct explanation of A
CAs true but R is false
DA is false but R is true
Show AnswerHide Answer
Correct Answer
ABoth A and R are true and R is the correct explanation of A
Model Answer
Assertion A is true because when an object moves in a circular orbit, its velocity is not constant since velocity is a vector quantity and changes with direction, even if the speed remains constant.
Reason R is true because the gravitational force of the Earth provides the centripetal force necessary to keep the satellite in a circular orbit and ensure that it does not fall.
Therefore, it explains why the satellite stays in orbit despite its changing velocity direction. Hence, Option 1 is correct.
The velocity at which the rocket launches the satellite is pre-determined and is such that it is not too great because then the satellite will escape into space and not too less because then the satellite will fall due to the gravitational force of attraction.
A diagram of the Earth at the centre with an apple, a person, a satellite and arrows marked gravitational force around it.
