Question

please answer question no.40

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Answer 1

Answer:

4.9 m/s²

Option( 3)

Step-by-step explanation:

HERE h=(√2-1)Re

Value of acceleration due to gravity at height h is:

g1=GM/(Re+h)²---------(1)

g at earth surface

g=GM/R²---------------------(2)

Dividing (1) by (2)

g1/g=GM/(Re+h)² / GM/R²

 =GM/(Re+h)² × R²/GM

=Re²/(Re+h)²

=Re²/ [ Re+(√2-1)Re)²

=Re²/ [ Re+(√2-1)Re)²

=Re²/ [ Re+√2Re-Re)²

=Re²/ (√2Re)²

=Re² / 2Re²

=1/2

hence g1=g/2

=9.8/2

=4.9 m/s²

Option( 3)

Answer 2

Answer:

4.9 m/s²

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