Assertion : length of day is slowly increasing. Reason : dominant effect causing a slowdown in rotat

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7.Gravitation

easy

$Assertion$ : The length of the day is slowly increasing.
$Reason$ : The dominant effect causing a slowdown in the rotation of the earth is the gravitational pull of other planets in the solar system.

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

If the Assertion is correct but Reason is incorrect.

If both the Assertion and Reason are incorrect.

(AIIMS-2003)

Solution

The length of the day is slowly increasing not due to gravitational pull of other planets in the solar system but due to viscous force between the earth and the atmosphere around it. So Assertion is correct but Reason is incorrect

Standard 11

Physics

Obtain an expression for the variation in effective gravitational acceleration $g'$ with latitude due to earth’s rotation.

hard

An object is taken to a height above the surface of earth at a distance $\frac{5}{4} R$ from the centre of the earth. Where radius of earth, $R=6400\,km$. The percentage decrease in the weight of the object will be $….\%$

medium

(JEE MAIN-2022)

What is weightlessness ? Explain with example.

easy

Assuming earth to be a sphere of a uniform density, what is the value of gravitational acceleration in a mine $100\, km$ below the earth’s surface …….. $m/{s^2}$. (Given $R = 6400 \,km$)

medium

If the value of g at the surface of the earth is $9.8$ $m/{\sec ^2}$, then the value of g at a place $480\, km$ above the surface of the earth will be ………. $m/{\sec ^2}$. (Radius of the earth is $6400\, km$)

medium

$Assertion$ : The length of the day is slowly increasing. $Reason$ : The dominant effect causing a slowdown in the rotation of the earth is the gravitational pull of other planets in the solar system.

Solution

Similar Questions

Obtain an expression for the variation in effective gravitational acceleration $g'$ with latitude due to earth’s rotation.

An object is taken to a height above the surface of earth at a distance $\frac{5}{4} R$ from the centre of the earth. Where radius of earth, $R=6400\,km$. The percentage decrease in the weight of the object will be $….\%$

What is weightlessness ? Explain with example.

Assuming earth to be a sphere of a uniform density, what is the value of gravitational acceleration in a mine $100\, km$ below the earth’s surface …….. $m/{s^2}$. (Given $R = 6400 \,km$)

If the value of g at the surface of the earth is $9.8$ $m/{\sec ^2}$, then the value of g at a place $480\, km$ above the surface of the earth will be ………. $m/{\sec ^2}$. (Radius of the earth is $6400\, km$)

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$Assertion$ : The length of the day is slowly increasing.
$Reason$ : The dominant effect causing a slowdown in the rotation of the earth is the gravitational pull of other planets in the solar system.