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6. The Polar Orbits is used for:
- weather and military
- weather and communications
- communications and military
- research an weather
7. The Geostationary orbit takes 24hrs to orbit the earth?
8. The turning effect of a force is called a:
- moment
- centre of mass
- centripetal force
- centrifugal force
9. the stability of an object depends on:
- position of the centre of mass
- the surface area of the base of the object
- all of the above
- distribution of mass within the object
10. The bigger the angle between the centre of mass and the line of symmetry controls how big the moment is?
11. To improve accuracy:
- represt and take an average
- calibrate device and remove zero error
- use smaller scale on measuring device
12. Magnetism is caused by the movement of:
- particles
- electrons
- atoms
- protons
13. The rule to show the direction of magnetic force around a current is:
- none of the above
- the left-hand motor rule
- the right-hand corkscrew rule
- the right hand grip rule
14. A coil of wire used to create a magnetic field is called a solenoid?
15. Variables that effect the field strength of a solenoid are:
- density of coils
- all of the above
- thickness of wire
- number of coils
- amount of voltage
16. The generator effect induces a current flow in a conductor?
17. Another name for a generator is:
18. Transformers don't include:
- electromagnetism
- wires
- voltage
- coils of wire
19. Transformers only work with A.C current?
20. A step-up transformer:
- increases voltage
- increases current