Question
Asked Nov 20, 2019
115. An 800-newton person is standing in an
elevator. If the upward force of the elevator
on the person is 600 newtons, the person is
(1) at rest
accelerating upward
(3) accelerating downward
(4) moving downward at constant speed
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115. An 800-newton person is standing in an elevator. If the upward force of the elevator on the person is 600 newtons, the person is (1) at rest accelerating upward (3) accelerating downward (4) moving downward at constant speed

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Expert Answer

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Step 1

Given,

Weight of person,W = 800 N
Upward Force ,T= 600 N
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Weight of person,W = 800 N Upward Force ,T= 600 N

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Step 2

Since Weight of person is more than upward force i.e (W>T) acting. So the elevator will accelerate in downward direction. The forces acting on the elevator has been shown below,

elevator
a
W
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elevator a W

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Step 3

Acceleration of elevator is calculated by using Ne...

Sin ce,W mg
т
g
g 9.81 m/s2
600
61.16 Kg
9.81
т
Since (W>T)
и -Т -та
800-600 - (61.16)а
200
=3.27 m/s2
61.16
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Sin ce,W mg т g g 9.81 m/s2 600 61.16 Kg 9.81 т Since (W>T) и -Т -та 800-600 - (61.16)а 200 =3.27 m/s2 61.16

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Tagged in

Science

Physics

Newtons Laws of Motion

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