12- The gravitational field

Question 1

Acceleration for object moving in circular path?

Answer 1

a=v^2 /r

Question 2

Equation for angular velocity?

Answer 2

w=2πf

Question 3

Define gravitational field strength?
Units? Symbol?

Answer 3

The magnitude and direction of the force on a mass of 1kg at a given point within a gravitational field.
N/Kg
g

Question 4

gravitational field strength within the earth?

Answer 4

-4/3Gpπr

p is density of earth and r is distance from centre.

Question 5

Define gravitational potential.

Answer 5

The energy per kilo of material at a position in a gravitational field, being the work done to move 1kg from infinity to the point in question.

Question 6

Equation for escape velocity?

Answer 6

Vesc = ( 2GM/r )^0.5

Question 7

Define gravitational potential energy.

Answer 7

The potential energy of a mass due to its position in a gravitational field.

Question 8

Define potential gradient.

Answer 8

In radial gravitational field, the change of potential with radius dv/dr.