David Scott Selis
 PHY231, Spring 2008  Int
1
MIDTERM 1C
David Selis
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instructed to do so.
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David Scott Selis
 PHY231, Spring 2008  Int
3
MIDTERM 1C
2 pt
Consider A=48 m and B=2 s
2
. Please identify if the
operations below are dimensionally valid, and if they are,
whether or not the answer given is correct.
⊲
You can subtract B from A and get 46 m.
1
.
A
circlecopyrt
Dimensionally invalid operation
B
circlecopyrt
Valid operation, but the answer is incorrect
C
circlecopyrt
This is correct
⊲
You can divide A by B and get 24 m/s
2
.
2
.
A
circlecopyrt
Dimensionally invalid operation
B
circlecopyrt
Valid operation, but the answer is incorrect
C
circlecopyrt
This is correct
You are correct.
Your receipt is 1547132
4 pt
A student hurls a baseball directly upward with an ini
tial speed of 40 m/s. Later, the student catches the baseball
at the same position from which it was released.
For the
following statements, displacements are measured relative to
the release point and the upward direction is positive.
⊲
During the entire flight, the acceleration of the baseball is
negative.
3
.
A
circlecopyrt
True
B
circlecopyrt
False
⊲
At its highest point, the baseball has zero velocity.
4
.
A
circlecopyrt
True
B
circlecopyrt
False
⊲
During the entire flight, the displacement of the baseball is
positive or zero.
5
.
A
circlecopyrt
True
B
circlecopyrt
False
⊲
During the entire flight, the velocity of the baseball is pos
itive or zero.
6
.
A
circlecopyrt
True
B
circlecopyrt
False
You are partially correct.
Your receipt is 1545745
2 pt
Three balls are thrown from the top of a building with identi
cal initial speeds. The initial velocities of Ball 1 is horizontal
while that of Ball 2 is 30 degrees above the horizontal, and
that of Ball 3 is thirty degrees below horizontal.
⊲
Order the three balls (highest to lowest) according to the
horizontal component of their velocities when they hit the
ground.
7
.
A
circlecopyrt
Ball 1 : Ball 2 : Ball 3
B
circlecopyrt
Ball 1 : Ball 3 : Ball 2
C
circlecopyrt
Ball 2 : Ball 3 : Ball 1
D
circlecopyrt
Ball 2 : Ball 1 : Ball 3
E
circlecopyrt
Ball 3 : Ball 1 : Ball 2
F
circlecopyrt
Ball 3 : Ball 2 : Ball 1
G
circlecopyrt
Ball 1 : Ball 2 & Ball3 tie
H
circlecopyrt
Ball 2 & Ball 3 tie : Ball 1
I
circlecopyrt
All three balls tie
⊲
Order the three balls (highest to lowest) according to the
speeds with which they hit the groud.
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 Spring '08
 smith
 Acceleration, Friction, Mass, Velocity, David Scott Selis

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