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A 55.0 kg student feels a 2.68x10^-8 N gravitational force from a physics book 0.435 m away. what is the mass of the physics book?

 May 22, 2019
 #1
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F =[ G. M * m] / r^2
2.68E-8 =[6.67428E-11 * 55 * m] / .435^2, solve for m.
2.68×10^-8 = 1.93994×10^-8 m
Divide both sides by 1.93994E-8
m =  1.38149 - Kg - mass of the Physics' Book.

 May 22, 2019
 #2
avatar+18754 
+1

F =  G m1m2 / r^2     G = 6.674 x 10^(-11)  m^3/kg-s^2

 

2.68 x 10^-8  = 6.674 x 10^-11   55  m2 /  (.435^2)

 

solve for   m2 = 1.38 kg

 May 22, 2019

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