A 50 kg woman gets on an elevator at the ground floor [0h floor] of a skyscraper and pushes a button. The elevator accelerates upwards at 3 m/s? for 2s, then maintains a constant velocity for 2s, and then decelerates at 2 m/s² until it stops at her desired floor. A) If the skyscraper's floors are each 3 meters, what button did she push? B) During the upwards acceleration, does the normal force (from the floor of the elevator) or the force of gravity do more work? By how much? C) During the constant velocity part of the ride does the normal force or the force of gravity do more work? By how much? D) During the deceleration part does the normal force or the force of gravity do more work? By how much? E) For the total elevator ride, which force does more work? Could you have known this without doing any calculation?
A 50 kg woman gets on an elevator at the ground floor [0h floor] of a skyscraper and pushes a button. The elevator accelerates upwards at 3 m/s? for 2s, then maintains a constant velocity for 2s, and then decelerates at 2 m/s² until it stops at her desired floor. A) If the skyscraper's floors are each 3 meters, what button did she push? B) During the upwards acceleration, does the normal force (from the floor of the elevator) or the force of gravity do more work? By how much? C) During the constant velocity part of the ride does the normal force or the force of gravity do more work? By how much? D) During the deceleration part does the normal force or the force of gravity do more work? By how much? E) For the total elevator ride, which force does more work? Could you have known this without doing any calculation?
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Questions D and E
![1:20 PM Sun Apr 10
...
2)
2. A 50 kg woman gets on an elevator at the ground floor [0th floor] of a skyscraper and pushes a button.
The elevator accelerates upwards at 3 m/s? for 2s, then maintains a constant velocity for 2s, and then
decelerates at 2 m/s? until it stops at her desired floor.
A) If the skyscraper's floors are each 3 meters, what button did she push?
B) During the upwards acceleration, does the normal force (from the floor of the elevator) or the
force of gravity do more work? By how much?
C) During the constant velocity part of the ride does the normal force or the force of gravity do more
work? By how much?
D) During the deceleration part does the normal force or the force of gravity do more work? By how
much?
E) For the total elevator ride, which force does more work? Could you have known this without
doing any calculation?
v,'s V;²-2 ad
2
d; 9m
2m/s? until stop
1 az
d: vb:6"/s· 2s:12m
v: constant
a =0
Ve :0
3m
a 3m/s' for 2s
1.3m1s².2s`com
V:0
(om /s](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1fed7a52-65d8-44f4-988f-6c762cda0c09%2Fa280aaf9-0a94-4d36-9819-31614ee194d9%2F52cogs8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1:20 PM Sun Apr 10
...
2)
2. A 50 kg woman gets on an elevator at the ground floor [0th floor] of a skyscraper and pushes a button.
The elevator accelerates upwards at 3 m/s? for 2s, then maintains a constant velocity for 2s, and then
decelerates at 2 m/s? until it stops at her desired floor.
A) If the skyscraper's floors are each 3 meters, what button did she push?
B) During the upwards acceleration, does the normal force (from the floor of the elevator) or the
force of gravity do more work? By how much?
C) During the constant velocity part of the ride does the normal force or the force of gravity do more
work? By how much?
D) During the deceleration part does the normal force or the force of gravity do more work? By how
much?
E) For the total elevator ride, which force does more work? Could you have known this without
doing any calculation?
v,'s V;²-2 ad
2
d; 9m
2m/s? until stop
1 az
d: vb:6"/s· 2s:12m
v: constant
a =0
Ve :0
3m
a 3m/s' for 2s
1.3m1s².2s`com
V:0
(om /s
Transcribed Image Text:1:20 PM Sun Apr 10
*e 79%
D For the total elevator ride, which force does more work? Could vou have known this without
doing any calculation?
0:6mis?-:
d: 9m
-2. 2"/s² d
1 a: 2m/s until Stop
d. vb:l6"/s· 2s= 12m
v- constant
aso
a 3m/s' for 2s
d.
V = at : 3m/s. 2s= 6m/s
lom+ 12mt9m
= 27m
27m :9h button
3m
B)
Img
Nimlang)
: (640 N
Wys N.d,
= (64ON: lom
3840J
Ng:mgd.
SOkg.9.8/s*. om
= 2940 J
Wy-Nq=900 J
4
Work done by the normal force
Is 900 J larger.
15
C) Durng constant acc.
AN:0, so ame
as befor e.
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