mt2soln_08

mt2soln_08 - Midterm 2 solutions Page 1 of 2 Phy 9B UC...

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Unformatted text preview: Midterm 2 solutions, 11/21/08 Page 1 of 2 Phy 9B UC Davis Heat
flow a b r ƒ ƒ A ƒ ƒ ƒ ƒ A cos ƒ A T A A A A A A A cos ƒ Heat
flow a b r ƒ ƒ A ƒ ƒ ƒ ƒ A cos ƒ A T A A A A A A A cos ƒ Physics 9B-C Midterm 2 Solutions Cole [1] 

a)
remain
the
same


b)
True

c)

mass


d)

decrease

e)

all
of
the
above

f)

white

g)

0

 h)
False

i)
rise

j)

decrease. [2] 
a)
(
10
pts)
From
the
diagram
 A T = A + 2 A cos φ 

so
 I ∝ A T 2 = A 2 1 + 2cos φ ( ) 2 where
 I ∝ 3 A ( ) 2 = 9 A 2 .

Thus,
 I I = A 2 1 + 2cos φ ( ) 2 9 A 2 

õ

 I = I 1 + 2cos φ ( ) 2 9 b)
(
5
pts)
The
first
secondary
maximum
occurs
midway
between
the
minima
which
are
at
 φ = 2 π 3 
and
 4 π 3 .

The
first
secondary
max
occurs
at
ƒ
=
π
.

The
phasor
diagram
is:
 

 c)
(5
pts)
leaving
a
total
amplitude
of
 A. 

 I I = A 2 9 A 2 

õ

 I = 1 9 I . [3]

 The
water
starts
out
with
gravitational
potential
energy
which
gets
converted
into
heat.
 Taking
a
small
arbitrary
mass
 m 
of
the
water.

 mgh
=
Q 


Use
the
specific
heat
of
water
to
find
...
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This note was uploaded on 10/23/2009 for the course PHY 9B taught by Professor Cheng during the Fall '08 term at UC Davis.

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mt2soln_08 - Midterm 2 solutions Page 1 of 2 Phy 9B UC...

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