3. A scientist recorded the movement of a pendulum for 10 s. The scientist began recording when the pendulum
was at its resting position. The pendulum then moved right (positive displacement) and left (negative
displacement) several times. The pendulum took 4 s to swing to the right and the left and then return to its
resting position. The pendulum's furthest distance to either side was 6 in. Graph the function that represents
the pendulum's displacement as a function of time.
Answer:
f(t)
(a) Write an equation to represent the displacement of the pendulum as a function of time.
(b) Graph the function.
10
9
8
7
6
5
4
3
2
1
0
t
1
2
3
4
5
6
7
8
9 10
11
12
13 14
15
-1
-5.
-6
-7
-8
-9
-10-
A power outage occurs 6 min after the ride started. Passengers must wait for their cage to be manually
cranked into the lowest position in order to exit the ride. Sine function model: h = −82.5 cos (3πt) + 97.5
where h is the height of the last passenger above the ground measured in feet and t is the time of operation of
the ride in minutes.
(a) What is the height of the last passenger at the moment of the power outage? Verify your answer by
evaluating the sine function model.
(b) Will the last passenger to board the ride need to wait in order to exit the ride? Explain.
The Colossus Ferris wheel debuted at the 1984 New Orleans World's Fair. The ride is 180 ft tall, and passengers
board the ride at an initial height of 15 ft above the ground. The height above ground, h, of a passenger on the
ride is a periodic function of time, t. The graph displays the height above ground of the last passenger to board
over the course of the 15 min ride.
Height of Passenger in Ferris Wheel
180
160
140-
€120
Height, h (ft)
100
80
60
40
20
0
ך
1
2
3
4
5
6
7 8 9
10
11
12 13
14
15
Time of operation, t (min)
Sine function model: h = −82.5 cos (3πt) + 97.5 where h is the height of the passenger above the ground
measured in feet and t is the time of operation of the ride in minutes.
What is the period of the sine function model? Interpret the period you found in the context of the operation of
the Ferris wheel.
Answer:
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