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Quiz 3A
DL SEC
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Quiz Grade:
02/8/10
Last 6 digits of student ID
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Last name, first name:
________________
________________
First three letters of your last name
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Useful formulae:
Δ
E
th
=mc
p
Δ
T;
Δ
E
bond
=±
Δ
m
Δ
H;
PE
grav
=mgh;
KE=
½
mv
2
;
PE
SM
=
½
kx
2
;
E
total
= sum of all relevant energies;
Δ
E
open
=
Σ
Δ
E
i
= Q+W;
Δ
E
closed
=
Σ
Δ
E
i
=
0
1.
A large box slides down a hill
at a constant speed
from
a height
h
i
to a height
h
f
.
In 7A we have discussed the
energies in the equations above.
Consider a large enough
physical system so that it is a
closed
system.
Choose the
energies that are important in this problem and graph them,
to the right, as functions of the height,
h
.
Be sure to label
h
i
,
h
f
, and the name of each energy that you graph and be
sure to graph E
total
.
Hint,
note that this sliding box is
moving at a constant speed and so this is a little like the
coffee filter that you saw fall at a constant speed in DL.
Answer:
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This note was uploaded on 01/05/2011 for the course PHY 7A taught by Professor Pardini during the Winter '08 term at UC Davis.
 Winter '08
 PARDINI

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