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Chapter 1

Q. 1.20

Two particles have a mass of 8 kg and 12 kg, respectively. If they are 800 mm apart, determine the force of gravity acting between them. Compare this result with the weight of each particle.

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Verified Solution

F=G \frac{m_1 m_2}{r^2}

 

\text { Where } G=66.73\left(10^{-12}\right) m ^3 /\left( kg \cdot s ^2\right)

 

F=66.73\left(10^{-12}\right)\left[\frac{8(12)}{(0.8)^2}\right]=10.0\left(10^{-9}\right) N =10.0     nN

 

W_1=8(9.81)=78.5  N

 

W_2=12(9.81)=118  N