Yr 2 Stuffs

Question 1

Define force feild

Answer 1

A region in which a body experiences a non-contact force

Question 2

Define Gravitational field strength

Answer 2

Force per unit mass

Question 3

Plotting graphs of G (Gravitational field strength) against r for earth earth

Answer 3

G is Greatest at surface of the Earth

Question 4

Define gravitational potential

Answer 4

Gravitational potential energy of a unit mass at a certain point

Question 5

Graph of V against r in radial gravitational field

Answer 5

Question 6

Define gravitational potential difference

Answer 6

The energy needed to move a unit mass

Question 7

What are equipotentials?

Answer 7

Lines and surfaces that join all points with the same gravitational potential. Travelling along equipotential, gravitational potential difference is zero, as no work is being done against Gravitational force

Question 8

Equation for orbital speed

Answer 8

Question 9

Relation of period to radius for orbit

Answer 9

Question 10

Escape velocity

Answer 10

Question 11

Total energy of a sattelite…

Answer 11

Is always constant, is the sum of kinetic and gravitational potential energies

Question 12

Synchronous orbit

Answer 12

When object has an orbital period equal to rotational period

Question 13

Geostationary satellites

Answer 13

-same distance above earth (36000 km)
-Aligned along the plane of the equator
-same angular velocity of earth, so satellite remains above one point of earth’s surface

Question 14

Low orbiting sattelites

Answer 14

Any satellites which orbit between 180 and 200 km above earth
-cheaper to launch, need less powerful transmitters
-need multiple satellites for constant coverage

Question 15

Equation for period of orbiting satellite

Answer 15