ICSE Class 9: Gravitation Videos | Universal law of gravitation

• 552.3427×10^(-43) How to solve with process?  I was finding Force of gravitation between two electrons which masses 9.1×10^(-31)kg and both are at 1 fermi distance. And i ended up stucking here. Idk how to get the correct ans. Please help!!
• Define universal gravitational constant , hence state its value of its SI unit
• State Newton's law of gravitation.  
• How does  acclelaration due to gravity varies at poles and at equator
• Define universal gravitational constant , hence state its value of its SI unit
• What are factors affecting the time period?
• About big bang theory.
• Why does gravity does not affect gas??????
• What gravity can be increase or decrease by any mean. 
• when a leaf and a cricket ball is dropped at the same time from the same height, why does the ball reach the ground first even though acceleration due to gravity is same? it is said that for anybody, irrespective of its mass has the same acceleration due to gravity

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