Gravitational Potential — Practice Quiz

Question 1

Gravitational potential at Earth's surface (M = 6×10²⁴ kg, R = 6.4×10⁶ m):

Accepted Answer

−6.25 × 10⁷ J/kg

Answer

+6.25 × 10⁷ J/kg

Answer

−9.8 × 10⁷ J/kg

Answer

−1.0 × 10⁷ J/kg

Question 2

Potential energy of mass m at potential V is:

Accepted Answer

mV

Answer

−mV

Answer

m²V

Answer

V/m

Question 3

Gravitational field is related to potential by:

Accepted Answer

g = −∇V

Answer

g = +∇V

Answer

g = ∂V/∂t

Answer

g = V·r

Question 4

Two equal point masses M at distance 2r. Potential at midpoint:

Accepted Answer

−2GM/r

Answer

−GM/r

Answer

Zero

Answer

−GM/2r

Question 5

Surfaces of constant gravitational potential are:

Accepted Answer

Equipotential, perpendicular to g

Answer

Parallel to g

Answer

Along field lines

Answer

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