1. The problem statement, all variables and given/known data By what angle, in seconds of arc, will a plumbline be pulled out of its normal vertical direction by the gravitation attraction of a 10-ton that parks 20 ft away? Do you think that this effect could be detected? 2. Relevant equations I think (G*m1*m2)/r^2 3. The attempt at a solution I first converted 10 tons to Newtons which i got to be around 88964 Newtons (from some conversion website). then i divided 88964 by 9.8 to get 9077.96 kg for the truck. 20 ft becomes 6.096 meters. Plugging this into the equation, I get (G * (m(plumb) * 9077.96 kg))/(6.096 m)^2 I dont know how to find the mass of the plumbline.