(a(i))[2]
State the meaning of a field of force.
(a(ii))[1]
Define the term gravitational field strength.
(b)[3]
An isolated planet can be treated as a uniform sphere with radius $3.39 \times 10^{6}\,\text{m}$ and mass $6.42 \times 10^{23}\,\text{kg}$ concentrated at the centre. Calculate the gravitational field strength at the planet’s surface.
(c)[3]
Calculate the height above the planet’s surface in (b) where the gravitational field strength is $1.0\%$ smaller than it is at the surface.