- #1

Workout

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## Homework Statement

What is the strength of the gravitational field on the ground just above the oil deposit? Hint: Consider the missing mass as a sphere with a negative mass.

Given: a spherical oil deposit with radius 200m at a centre of depth 2.0km. The density of the Earth's crust is 2700 kg/m^3 and the crude oil is 900 kg/m^2. The strength of the gravitational field in the surrounding area is 9.81 N/kg.

## Homework Equations

a = GM/r^2

## The Attempt at a Solution

Okay I'm a little confused with this question. Isn't the strength of the gravitational field on the ground just above the oil deposit 9.81 m/s^2? It already said in the problem that the gravitational field in the surrounding area was 9.81 N/kg in my problem.