A lead sphere of mass attracts a small steel ball placed away from its centre with a…

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A lead sphere of mass

250\,\text{g}

attracts a small steel ball placed

8.0\,\text{cm}

away from its centre with a force of

2.0\times10^{-9}\,\text{N}

. Determine the mass of the steel ball, expressing your final answer in scientific notation correct to three significant figures. Show all unit conversions and algebraic steps clearly.

Related theory

Universal Law of Gravitation
Gravitation & Weight
Gravitation

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