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Byju's Answer
Standard XII
Physics
Applying NLM along 3 Axis
The weight of...
Question
The weight of a person riding in an elevator is an example of
A
Apparent Weight
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B
Kinetic energy
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C
Potential Energy
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D
None of these
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Solution
The correct option is
A
Apparent Weight
The person in the accelerating elevator always measures his apparent weight.
If the elevator is accelerating upwards, his apparent weight
W
′
=
W
+
m
a
If the elevator is accelerating downwards, his apparent weight
W
′
=
W
−
m
a
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The apparent weight of a person in an elevator is less than the weight of the person if the lift is
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Assertion :The apparent weight of a body in an elevator moving with some downward acceleration is less than the actual weight of a body. Reason: The part of the weight is spent on producing downward acceleration, when body is in elevator.
Q.
Assertion :The apparent weight of a body of mass m in an elevator moving with a downward acceleration 'a' is
R
=
m
(
g
−
a
)
Reason: The part of weight (mg) spent on producing downward acceleration 'a' is ma. Therefore apparent weight
=
m
g
−
m
s
=
m
(
g
−
a
)
.
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