lenoir (wml297) – homework 03 – Turner – (58220)
1
This printout should have 12 questions.
Multiplechoice questions may continue on
the next column or page – fnd all choices
beFore answering.
001
10.0 points
The graph 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 graph shows the corresponding dis
placement
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.
t
x
0
t
Q
t
R
t
S
t
P
4.
t
x
0
t
Q
t
R
t
S
t
P
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
correct
8.
None oF these graphs is correct.
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:
Vx
=
i
Vv dt .
Because the velocity increases linearly From
zero at frst, then remains constant, then de
creases linearly to zero, the displacement will
increase at frst proportional to time squared,
then increase linearly, and then increase pro
portional to negative time squared.
±rom these Facts, we can obtain the correct
answer.
t
x
0
t
Q
t
R
t
S
t
P
002
(part 1 oF 5) 10.0 points
Consider a toy car which can move to the
right (positive direction) or leFt on a horizon
tal surFace along a straight line.
car
v
O
+
What is the accelerationtime graph iF the
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2
car moves toward the right (away from the
origin), speeding up at a steady rate?
1.
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 Spring '10
 Turner
 Derivative, Acceleration, Velocity, Lenoir, tQ tR tS

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