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Gre4nikov [31]
3 years ago
12

What are two ways in which ultrasound technology produces images

Physics
1 answer:
arsen [322]3 years ago
6 0
Fetal and ophthalmic
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If an element is a semi-conductor, which classification correctly describes it?
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Metal

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semiconductors are materials which have a conductivity between conductors (generally metals)

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Why would knowing the characteristics of circuits be important in designing electrical circuits?
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Since astronauts in orbit are apparently weightless, a clever method of measuring their masses is needed to monitor their mass g
djyliett [7]

Answer:

a) m = 69.0 kg

b) release some gas in the opposite direction to the astronaut's movement

Explanation:

a) Let's use Newton's second law

         F = m a

         m = F / a

         m = 60.0 / 0.870

         m = 69.0 kg

b) when we exert a force on the astronaut it acquires a momentum po, as the astronaut system plus spacecraft is isolated, the momentum is conserved

         p₀ = p_f

         m v = M v '

         v ’= \frac{m}{M} \ v

so we see that the ship is moving backwards, but since the mass of the ship is much greater than the mass of the astronaut, the speed of the ship is very small.

One method to avoid this effect is to release some gas in the opposite direction to the astronaut's movement so that the initial momentum of the astronaut plus the gas is zero and therefore no movement is created in the spacecraft.

3 0
2 years ago
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