Two astronauts are floating close to each other in space. Can they talk to each other without using any special device? Give reason.

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Solution

Sound requires a medium for propagation. Therefore, two astronauts floating close to each other in space will not be able to talk to each other without using any special device because in space there is vacuum ( no material medium).

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Q. Two astronauts, each of mass

75 k g

, are floating next to each other in space, outside the space shuttle. They push each other through a distance of an arm's length

= 1 m

each with a force of

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.If the final relative velocity of the two, w.r.t each other is

V_{0} m / s

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\frac{(V_{0})^{2}}{4} (

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1 m

)

Sam's father and mother are astronauts. Last month they returned from a tour to the Moon. Sam's father told him that they had air filled helmets and they also had microphones, which they used for talking to each other. Why did they use microphones to talk even after they were close enough to hear the sound of each other?

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