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6. Stability can be increased by...
- having a center of mass as low as possible and having a wide base
- having the center of mass as big as possible and having a wide base
- having a center of mass as high as possible and having a wide base
- having a center of mass as big as possible and having a thin base
7. The ciliary muscles...
- help focus the light onto the retina
- Change the thickness of the lens, which are attached via the suspensory ligament
- are a layer of light sensitive cells
- are a colored ring of muscles in your eye
- they attach to the suspensory ligament, which changes the thickness of the lens
8. A relay is used to...
- switch on/off electrical appliances
- as a safety mechanism in electrical appliances
- create electromagnetic induction
- not enough information is given
9. When an object moves in a circular motion, you can increase the speed by...
- increase the radius and increase the mass
- increasing the mass and decreasing the radius
- increasing the radius and decreasing the mass
- decrease the radius and decrease the mass
10. What is the frequency of an x-ray? (^ means 'to the power of')
- 3x10^9 to 3x10^16
- 0.01 - 10 nanometres
- 3x10^16 to 3x10^19
- 10-100 nanometres