Question

An object on Earth has a weight of $150$ newtons. On which planet would the same object have an approximate weight of $170$ newtons?

• A. Venus
• B. Saturn
• C. Uranus
• D. Neptune

Answer 1

The correct option is B Saturn

On Earth the acceleration due to gravity is $9.8m/se{c}^2$. Thus, for an object with a weight of $150$ newtons, the formula $W=mg$ becomes $150=m\left(9.8\right)$, which shows that the mass of an object with a weight of $150$ newtons on Earth is about $15.3$ kilograms.

Substituting this mass into the formula $W=mg$ and now using the weight of $170$ newtons gives $170=15.3g$, which shows that the second planet’s acceleration due to gravity is about $11.1m/se{c}^2$.

According to the table, this value for the acceleration due to gravity holds on Saturn.