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7.Gravitation
easy
$Assertion$ : Space rocket are usually launched in the equatorial line from west to east
$Reason$ : The acceleration due to gravity is minimum at the equator.
A
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
B
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.
(AIIMS-2017)
Solution
Space rocket are usually launched from west to east to take the advantage of rotation of earth.
Also $g' = g – {\omega ^2}R\,{\cos ^2}\,\lambda ,$ at equator $\lambda = 0$, and so $\cos \,\lambda = 1$, and $g'$ is least
Standard 11
Physics
