Answer to Question #104658 in Mechanics | Relativity for Adrian

Question #104658
A rocket blasts off from rest and attains a speed of 45 m/s in 15 sec. An astronaut has a mass of 57 kg. What is the astronaut's apparent weight during takeoff?
1
Expert's answer
2020-03-06T10:24:45-0500

As per the question,

Initial velocity of the rocket is (u)=0

Final velocity (v)=45 m/sec

time (t)=15 sec

Mass of the astronaut =57 Kg

Now, applying the newton's first law of motion,

Let the acceleration of the rocket is a,

v=u+atv=u+at

45=0+a×15\Rightarrow 45=0+a\times 15

a=4515=3m/sec2\Rightarrow a=\dfrac{45}{15}=3 m/sec^2

Now,

During the take off of the rocket, pseudo force will work on astronaut.

Hence, F=ma=57×3=171NF=ma =57\times 3 =171N

Hence total reading of the weighting machine =mg+mamg+ma

=171+57×9.8=729.6N=171+57\times 9.8 =729.6N

Hence total reading of the weighting machine will be 729.6N.


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