Image from: F. P. Beer, R. E. Johnston, and P. J. Cornwell, Vector mechanics for engineers: Dynamics, 11th ed. New York, NY, United States: McGraw-Hill Inc.,US, 2015.
A spring scale A and a lever scale B having
Image from: F. P. Beer, R. E. Johnston, and P. J. Cornwell, Vector mechanics for engineers: Dynamics, 11th ed. New York, NY, United States: McGraw-Hill Inc.,US, 2015.