NEET
- Exam
- NEET
- Subject
- Physics
- Chapter
- Gravitation
NEET · Physics · Gravitation
Given below are two statements: One is labelled as Assertion (A)...
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : An artificial satellite is moving in a circular orbit of the earth. If the gravitational pull suddenly disappears, then it moves with the same speed tangential to the original orbit.
Reason (R) : The orbital speed of a satellite decreases with the increase in radius of the orbit. In the light of the above statements, choose the most appropriate 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 and (R) is NOT the correct explanation of (A).
- C(A) is true but (R) is false.
- D(A) is false but (R) is true.
Correct answer
B. Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
Step-by-step solution
After the force disappears, it continue to move in a straight line due to inertia of direction and orbital speed (V_0=\sqrt{\frac{G M}{r}}).
So, (\mathrm{V}_0 \propto \frac{1}{\sqrt{\mathrm{r}}} \Rightarrow \mathrm{r} \uparrow \Rightarrow \mathrm{V}_0 \downarrow)