# Pyhsics P5

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No, because velocity has a direction as well as a number which means it is a vector quantity
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What shape is the path of a projectile
A parabola
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If the total momentum before a collision is zero, what is the total momentum of the system after the collision?
zero(Momentum before=Momentum after)
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If the volume of gas decreases, what happens to the pressure?
It inccreases
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If the temperature decreases, what happens to the pressure?
It decreases
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State two differences between a low polar orbit and a geostationary satellite?
1)Low polar orbit moves faster than geostationary as it is closer to earth 2)Low polar orbit satellites can monitor the whole surface of the earth whereas geostationary satellites stay at the same point above the earth.
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Why do waves with a frequency of higher than 30GHz cannot be used to carry satellite signals.
Because rain and dust will absorb them, reducing the strength of the signal
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Why do satellite transmitting and receiving dishes need to be carefully aligned?
Because the microwaves are transmitted as a narrow beam that dose not spread out.
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Draw simple wave diagrams to describe the difference between constructive and destructive interferance
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What effect does a polarising filter have on the light passing through it?
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For which colour light does glass have the higher refractive index -blue or red?
Blue
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What is the difference between a real image and a virtual image
real images can projected on to screens but virtual images cannot
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## Other cards in this set

### Card 2

#### Front

What shape is the path of a projectile

A parabola

### Card 3

#### Front

If the total momentum before a collision is zero, what is the total momentum of the system after the collision?

### Card 4

#### Front

If the volume of gas decreases, what happens to the pressure?

### Card 5

#### Front

If the temperature decreases, what happens to the pressure?