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Two fat astronauts each of mass 120 kg are traveling in a closed spaceship moving at a speed of 15 km/s in the outer space far removed from all other material objects. The total mass of the spaceship and its contents including the astronauts is 660 kg. If the astronauts do slimming exercise and thereby reduce their masses to 90 kg each with ,what velocity will the spaceship move? |
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Answer» Given Data :- Speed of space ship :- 15km/s Mass of astronauts :- 120 +120 = 240 Mass of space ship :- 660 including mass of astronauts IF mass of astronauts is REDUCED to 90 kg 240 - 90 =150 so 150 kg mass would be reduced total mass would alter as 660-150 = 510 NOW THE QUESTION IS WHAT WOULD BE THE VELOCITY OF SPACE SHIP → velocity would be constant , There would be No Change in velocity WHY ?? • First we should now what will CAUSE a change in velocity ◾ If any force ACTS on the body in OPPOSITE direction then the velocity change HERE IN THE GIVEN QUESTION » Mass had changed but there is no force Created there » Since there is no force created , there would be no change in velocity Note :- At first I have did calculations to show the change in mass , and therefore to conclude that No Force would be created ========================== Glad if Helped !! Regards :- SunitaWilliams |
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