Main content

High school physics

Lesson 4: Newton's law of gravitation

Gravitational field strength

The planet Gallifrey has 2 times the gravitational field strength and 2 times the radius of the Earth.

How does the mass of the planet Gallifrey compare with the mass of Earth?

(Choice A)
m, start subscript, start text, G, a, l, l, i, f, r, e, y, end text, end subscript, equals, 2, m, start subscript, start text, E, a, r, t, h, end text, end subscript
(Choice B)
m, start subscript, start text, G, a, l, l, i, f, r, e, y, end text, end subscript, equals, 2, square root of, 2, end square root, m, start subscript, start text, E, a, r, t, h, end text, end subscript
(Choice C)
m, start subscript, start text, G, a, l, l, i, f, r, e, y, end text, end subscript, equals, 8, m, start subscript, start text, E, a, r, t, h, end text, end subscript
(Choice D)
m, start subscript, start text, G, a, l, l, i, f, r, e, y, end text, end subscript, equals, m, start subscript, start text, E, a, r, t, h, end text, end subscript

Stuck?