mt1sol_11

mt1sol_11 - Phy 9A-C, Midterm 1 Solutions, Page 1 of 1...

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Unformatted text preview: Phy 9A-C, Midterm 1 Solutions, Page 1 of 1 4/22/11 ACME ™ dynomite v √ ø a √ F N mg f F N f mg ACME ™ dynomite v a √ F N mg f F N f mg Physics 9A-C Midterm 1 Solutions Cole [1]

a)
kg·m/s 2 ,

b)
velocity,

c)
angular
speed,

d)
never,

e)
 a√
+
b√
+
c√
=
 0,

f)
-sin
oe
 î 
+
cos
oe
 ∆ ,


 g)
greatest
at
the
right
edge,


h)
- 
 GMm r 2 ˆ r ,


i)
0,


j)

acceleration
opposite
to
 v√ 
. [2]
a)
(5
pts)
The
initial
velocity
is
at
 t 
=
0,
õ
 
 v = F m ω cos ω t ( ) t = = F m ω cos0 = F m ω b)

(5
pts)
 F
=
ma 
where

 
 a = dv dt = d dt F m ω cos ω t ( ) = − F m sin ω t 

õ
 F
=
-
Fø sin
∑ t. c)
(5
pts)
 
 dx = dx dt dt = vdt 

Integrate
using
 xø
=
 0:

 
 x ∫ dx = F m ω t ∫ cos ω t dt 
õ

 
 x = F m ω...
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This note was uploaded on 09/28/2011 for the course PHY 9A taught by Professor Svoboda during the Spring '08 term at UC Davis.

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