homework 03 – YOO, HEE – Due: Jan 24 2008, 4:00 am
1
Question 1, chap 2, sect 2.
part 1 of 1
10 points
The graph below shows the velocity
v
as a
function of time
t
for an object moving in a
straight line.
t
v
0
t
Q
t
R
t
S
t
P
Which of the following graphs shows the
corresponding displacement
x
as a function of
time
t
for the same time interval?
1.
t
x
0
t
Q
t
R
t
S
t
P
2.
t
x
0
t
Q
t
R
t
S
t
P
3.
None of these graphs are correct.
4.
t
x
0
t
Q
t
R
t
S
t
P
correct
5.
t
x
0
t
Q
t
R
t
S
t
P
6.
t
x
0
t
Q
t
R
t
S
t
P
7.
t
x
0
t
Q
t
R
t
S
t
P
8.
t
x
0
t
Q
t
R
t
S
t
P
9.
t
x
0
t
Q
t
R
t
S
t
P
Explanation:
The displacement is the integral of the ve
locity with respect to time:
vectorx
=
integraldisplay
vectorvdt.
Because the velocity increases linearly from
zero at first, then remains constant, then de
creases linearly to zero, the displacement will
increase at first proportional to time squared,
then increase linearly, and then increase pro
portional to negative time squared.
From these facts, we can obtain the correct
answer.
t
x
0
t
Q
t
R
t
S
t
P
Question 2, chap 2, sect 4.
part 1 of 5
10 points
The following 5 questions refer to a toy
car which can move to the right or left on a
horizontal surface along a straight line (the +
distance axis).
The positive direction is to the right. Dif
ferent motions of the car are described be
low.
Choose the accelerationtime graph
which corresponds to the motion of the car
described in each statement.
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homework 03 – YOO, HEE – Due: Jan 24 2008, 4:00 am
2
car
v
g
O
+
The car moves toward the right (away from
the origin), speeding up at a steady rate.
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 Spring '08
 Turner
 Physics, Acceleration, Work, 1 %, 0 m/s, 1.188 min

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