Question

Calculate the force of gravitation due to earth on a ball of 1 kg mass lying on the ground.(Mass of earth `=6xx10^(24) kg ` Radius of earth `=6.4xx10^(3)`km and `G=6.7xx10^(-11)Nm^(2)/Kg^(2)`

Answer 1

The force fo gravitation is calculated by using the formula `F=Gxx(m_(1)xxm_(2))/r^(2)`
Gravitation constant `G=6.7xx10^(-11) Nm^(2)/Kg^(2)`
Mass of earth `m_(1)=6xx10^(24)kg`
Mass of ball `m_(2)=1kg`
Distance between centre r=Radius of earth of earth and ball
`=6.4xx10^(3)km `
`6.4 xx 10^(3)xx1000m`
`6.4xx10^(6)m`
Now putting these values in the above formula we get `F(67.xx10^(-11)xx6xx10^(24)xx1)/(6.4xx10^6)^2`
f=9.8 newtons

Comments

Nice but what is the second method give please