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23 Nov 2019

A 50-kg person is riding in an elevator that is moving upward at a speed of 4 m/s. The elevator then slows down with uniform acceleration to come to rest at the top floor. It is slowing down for 3 seconds. Find the normal force that the elevator floor exerts on the person while it is slowing down. Also find the distance the elevator travels while it is slowing down.

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Irving Heathcote
Irving HeathcoteLv2
11 Jul 2019
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

<p>A person who normally weighs 200 pounds is standing on a scale inside an elevator. The elevator is moving upwards with a speed of 7 m/s, and then begins to slow down at a rate of 5 m/s2. Before the elevator begins to slow down, the reading of the scale is _________, and while the elevator is slowing down, the reading of the scale is _________</p>

A single mass m1 = 4.5 kg hangs from a spring in a motionless elevator. The spring is extended x = 15 cm from its unstretched length.
 
1)What is the spring constant of the spring?
 
Now, three masses m1 = 4.5 kg, m2 = 13.5 kg and m3 = 9 kg hang from three identical springs in a motionless elevator. The springs all have the same spring constant that you just calculated above.
 
2)What is the force the top spring exerts on the top mass?
 
3)What is the distance the lower spring is stretched from its equilibrium length?
 
4)Now the elevator is moving downward with a velocity of v = -2 m/s but accelerating upward with an acceleration of a = 3.8 m/s2. (Note: an upward acceleration when the elevator is moving down means the elevator is slowing down.)
 
What is the force the bottom spring exerts on the bottom mass?
 
5) What is the distance the upper spring is extended from its unstretched length?
 
6) Finally, the elevator is moving downward with a velocity of v = -2.5 m/s and also accelerating downward at an acceleration of a = -2.2 m/s2.
 
The elevator is:
 
speeding up
 
slowing down
 
moving at a constant speed
 
7) Rank the distances the springs are extended from their unstretched lengths:
 
x1 = x2 = x3
 
x1 > x2 > x3
 
x1 < x2 < x3
 
8) What is the distance the middle spring is extended from its unstretched length?

Q1. A 72.0-kg man stands on a spring scale in an elevator.Starting from rest, the elevator ascends, attaining its maximumspeed of 1.20 m/s in 0.800 s. It travels with this constant speedfor the next 5.00 s. The elevator then undergoes a uniformacceleration in the negative goes ydirection for 1.50 s and comes to rest. What does the springscale register (a) before the elevator starts to move? (b) duringthe first 0.800 s? (c) while the elevator is traveling at constantspeed? (d) during the time it is slowing down?

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