Physics Exam Prep

Front 1

Gravitational field strength

Back 1

The gravitational field strength at a point is the force per unit mass that would be exerted on a test mass at that point. It is also the negative potential gradient (Negative derivative of V is g).

Front 2

Electric field strength

Back 2

The electric field strength at a point is the force per unit charge that would be exerted on a positive test charge at that point. It is also the negative potential gradient (Negative derivative of V is E).

Front 3

Gravitational potential (V)

Back 3

Gravitational potential at a point in a field is the work done against the field per unit mass in bringing a point test mass from infinity to that point. -GM/r

Front 4

Electric potential (V)

Back 4

Electric potential at a point in a field is the work done against the field per unit charge in bringing a positive point test charge from infinity to that point. kq/r

Front 5

Define Albedo

Back 5

The ratio of total scattered or reflected power to total incident power is known as the albedo.
albedo = (total scattered or reflected power) / (total incident power)

Front 6

Define Surface heat capacity, C(s)

Back 6

Surface heat capacity is defined as the amount of energy needed to raise the temperature of unit area of a planet's surface by one kelvin. (unit: Jm^-2K^-1)