mt2sol_08

mt2sol_08 - å R R cos
å mg F N å mg cos å å R R...

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Unformatted text preview: å R R cos
å mg F N å mg cos å å R R cos
å mg F N å mg cos å Phyiscs 9A-A Midterm 2 Solutions Cole [1] 

a)
True

b)
 U
=
E ,

c)
Î p√ ,

d)
lesser,

e)
False,

f)
steepest,


g)
greater,


h)
momentum,


 i)
zero,


j)

Watt. [2] 

a)
(15
pts) 
W
=
 F ⋅ d r 1 2 ∫ .

The
displacement
occurs
along
3
segments
:

 W 1 = − β y ˆ j ( ) ⋅ dy ˆ j ( ) 3 ∫ = − β y dy 3 ∫ 
=
 − 1 2 β y 2 3 = − 9 2 β .



 W 2 = − β y ˆ j ( ) ⋅ dx ˆ i ( ) 3 ∫ = 


 W 3 = − β y ˆ j ( ) ⋅ dx ˆ i + dy ˆ j ( ) ∫ = − β y dy 3 ∫ 
.

õ

 W 3 = + 9 2 β 

Finding
the
total
work
done

 W 1 + W 2 + W 3 = − 9 2 β + + 9 2 β = .

b)
(5
pts)

The
work
done
around
a
closed
path
is
zero,
so
 the
work
is
independent
of
the
path.

The
force
is
a
conservative
force. 
...
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This note was uploaded on 05/30/2008 for the course PHY 9A taught by Professor Svoboda during the Spring '08 term at UC Davis.

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mt2sol_08 - å R R cos
å mg F N å mg cos å å R R...

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