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zainabrehman
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a body of mass 2 kg is suspended in an elevator by means of a spring balance the balance reads its weight when elevator moves up with an acceleration of 5ms_2 as
30.5n b 29.6n c 26.5n d 9.8n
 3 years ago
 3 years ago
zainabrehman Group Title
a body of mass 2 kg is suspended in an elevator by means of a spring balance the balance reads its weight when elevator moves up with an acceleration of 5ms_2 as 30.5n b 29.6n c 26.5n d 9.8n
 3 years ago
 3 years ago

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mujtabazarrar Group TitleBest ResponseYou've already chosen the best response.0
this question is a bit lengthy....
 3 years ago

mujtabazarrar Group TitleBest ResponseYou've already chosen the best response.0
the actual weight of the mass is 20 newtons......first of all..
 3 years ago

mujtabazarrar Group TitleBest ResponseYou've already chosen the best response.0
when the elevator moves upward with an acceleration a = 5 m/s^2 ......then the spring balance will show(give reading) of apparent weight more than the actual weight ..... which means that the choice "d"9.8 is definitely wrong....
 3 years ago

mujtabazarrar Group TitleBest ResponseYou've already chosen the best response.0
now while the elevator is moving upward with an acceleration ...... there are two forces acting on it ......the upward tension "T" and downward weight "w".....
 3 years ago

mujtabazarrar Group TitleBest ResponseYou've already chosen the best response.0
As the mass "m" along with the elevator are accelerating upward with acceleration "a".....So a net force F=ma is acting in the upward direction ..... this net force F=ma= the difference between T and w. T>W because the elevator+mass are both accelerating upward.
 3 years ago

mujtabazarrar Group TitleBest ResponseYou've already chosen the best response.0
Therefore, F=ma=TW  ma=TW Putting values ma=Tmg T=ma+mg T=m(a+g) T=2(5+9.8) T=29.6N As the tension is equal to the apparent weight of the mass being shown by the spring balance....
 3 years ago

mujtabazarrar Group TitleBest ResponseYou've already chosen the best response.0
So option b is the right choice....
 3 years ago

mujtabazarrar Group TitleBest ResponseYou've already chosen the best response.0
Did you understand?
 3 years ago
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