A 71.0 kg person stand on a scale in an elevator. What does the scale read (in N
ID: 1330069 • Letter: A
Question
A 71.0 kg person stand on a scale in an elevator. What does the scale read (in N) whe the elevator is ascending at a constant speed of 3.5 m/s? What does the scale read (in kg) when the elevator is ascending at a constant speed of 3.5m/s? What does the scale read ( in N) When the elevator is falling at 3.5 m/s? What does the scale read (in kg) when the elevator is falling at 3.5 m/s? What does she scale read (in N & in kg) when the elevator is accelerating upward at 3.5 m/s^2? What does the scale read (in kg) when the elevator is accelerating downward at 3.5 m/s^2?A 71.0 kg person stand on a scale in an elevator. What does the scale read (in N) whe the elevator is ascending at a constant speed of 3.5 m/s? What does the scale read (in kg) when the elevator is ascending at a constant speed of 3.5m/s? What does the scale read ( in N) When the elevator is falling at 3.5 m/s? What does the scale read (in kg) when the elevator is falling at 3.5 m/s? What does she scale read (in N & in kg) when the elevator is accelerating upward at 3.5 m/s^2? What does the scale read (in kg) when the elevator is accelerating downward at 3.5 m/s^2?
Explanation / Answer
given,
mass = 71 kg
speed = 3.5 m/s
since the speed is constant so no force will be acting aart from gravity so,
scale will read = 71 kg
weight = mass * gravity
weight = 71 * 9.8
scale will read = 695.8 N
if the elevator is falling at 3.5 m/s then also the answer will remain same as velocity is constant so no force except gravity
so,
scale will read = 71 kg or 695.8 N
when elevator is accelerating upward with acceleration of 3.5 m/s^2 then,
net weight = mass * (g + 3.5)
net weight = 71 * (9.8 + 3.5)
net weight = 944.3 N or 96.357 kg
whn elevator is accelerating downward with acceleration of 3.5 m/s^2 then
net weight = mass * (g - 3.5)
net weight = 71 * (9.8 - 3.5)
net weight = 447.3 N or 45.643 kg
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