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## An 80 kg astronaut has gone outside his space capsule to do some repair work. Unfortunately, he forgot to lock his safety tether in place, a

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An 80 kg astronaut has gone outside his space capsule to do some repair work. Unfortunately, he forgot to lock his safety tether in place, and he has drifted 5.0 m away from the capsule. Fortunately, he has a 1000 W portable laser with fresh batteries that will operate it for 1.0 h. His only chance is to accelerate himself toward the space capsule by firing the laser in the opposite direction. He has a 10-h supply of oxygen.

a. How long will it take him to reach safety?

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Physics
6 months
2021-07-16T16:53:19+00:00
2021-07-16T16:53:19+00:00 1 Answers
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## Answers ( )

Answer:the time taken by the astronaut to reach safety =

9.8 hrExplanation:The equation for intensity can be written as :

where :

Replacing that into the above previous equation; we have:

However ; the force needed to push the astronaut is as follows:

F = ma

where ;

m = mass of the astronaut and a = its acceleration

we as well say;

Replacing P with 1000 W ; m with 80 kg and for c

Then; a =

a =

It is also known that the battery will run for one hour and after which the battery on the laser will run out

Then to determine the change in the position after the first hour ; we have:

= 0.27 m

Furthermore, the final velocity of the astronaut is determined as:

where ;

replacing and a = ; Then:

Also; when he drifted 5.0 m away from the capsule; the distance is far short of the 5 m but he still have 9 hours left of oxygen . In addition to that, he acceleration is also zero and the final velocity remains the same, so:

To find the final distance traveled by the astronaut ;we have:

where;

= the final distance

d = total distance

So;

The time taken to reach the final distance can be calculated as:

where;

= is the time to reach the final distance

Replacing 4.73 for and m/s for

We knew the laser was operated for 1 hour; thus the total time taken by the astronaut to reach the final distance is the sum of the time taken to reach the final distance and the operated time of the laser.

Hence ; the time taken by the astronaut to reach safety =

9.8 hr