Answer to Question #180837 in Physics for Emmanuel Castro

Question #180837

The tension of a string is 18 N. What is the mass of the hanging object?


1
Expert's answer
2021-04-14T21:00:13-0400


According to the third Newton's law, the tension in the string is equal to the weight of the object. If the object is in equilibrium, the tension of a string is equal to the gravity force that acts on the object:


T=mgT = mg

where mm is the mass of the object, and g=9.8N/kgg = 9.8 N/kg is the gravitational acceleration. Since T=18NT= 18N, obtain:


m=Tg=18N9.8N/kg1.8kgm =\dfrac{T}{g} = \dfrac{18N}{9.8N/kg}\approx 1.8kg

Answer. 1.8 kg.


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