Feedback — 1D CC_Describing and Predicting MotionHelp
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Some questions provided by Matter and Interactions (3rd. Ed.), R. Chabay & B. Sherwood.
Copyright (2010, John Wiley & Sons). This material is used by permission of John Wiley & Sons, Inc.
Question 1
At time t1=12 s, a car is located at ⟨107,0,0⟩ m and has velocity ⟨5,0,0⟩ m/s. At time t2=16 s,
what is the x component of the position of the car (in meters)?
(The velocity is constant in magnitude and direction during this time interval.)
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127
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Answer : 127
Question 2
Following the previous question, at time t2=16 s, what is the y component of the position of the car?
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Answer : 0
Question 3
Following the previous question, at time t2=16 s, what is the z component of the position of the car?
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Answer : 0
Question 4
At a certain instant a ball passes location ⟨0,20,0⟩ m. In the next 2 seconds, the ball's average
velocity is ⟨0,26,0⟩ m/s. At the end of this 2 second time interval, what is the height y (in meters) of
the ball?
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72
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Answer : 72
Question 5
Here are the positions at three different times for a bee in flight (a bee's top speed is about 7 m/s).
time
5.4 s
5.9 s
6.4 s
position ⟨−3.9,0,0⟩ m ⟨−1.4,0,0⟩ m ⟨0.6,0,0⟩ m
Ex
(a) Compute the bee's average velocity between 5.4 s and 5.9 s. Be careful with signs.
What was the x component of the bee's average velocity (in m/s) between 5.4 s and 5.9 s?
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-2.65
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Answer : 5
Question 6
Following the previous question, what was the y component of the bee's average velocity (in m/s)
between 5.4 s and 5.9 s?
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Answer : 0
Question 7
Following the previous question, what was the z component of the bee's average velocity (in m/s)
between 5.4 s and 5.9 s?
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Question 8
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(b) Compute the bee's average velocity between 5.4 s and 6.4 s.
What was the x component of the bee's average velocity (in m/s) between 5.4 s and 6.4 s?
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-1.65
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Answer : 4.5
Question 9
Following the previous question, what was the y component of the bee's average velocity (in m/s)
between 5.4 s and 6.4 s?
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Answer : 0
Question 10
Following the previous question, what was the z component of the bee's average velocity (in m/s)
between 5.4 s and 6.4 s?
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Question 11
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(c) Of the two average velocities you calculated in part (a) and part (b), which is the best estimate of
the bee's instantaneous velocity at time 5.4 s?
Your Answer
Score
--
a (average velocity between between 5.4 s and 5.9 s)
b (average velocity between 5.4 s and 6.4 s)
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Answer : a (average velocity between between
5.4 s and 5.9 s)
Question 12
(d) Using the best information available, compute the displacement of the bee during the time
interval from 5.4 s to 5.45 s?
What was the x component of the bee's displacement (in meters) during this time interval ?
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-1
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Answer : 0.25
Question 13
Following the previous question, what was the y component of the bee's displacement (in meters)
from 5.4 s to 5.45 s?
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Question 14
Following the previous question, what was the z component of the bee's displacement (in meters)
from 5.4 s to 5.45 s?
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Answer : 0
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