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PHY121 – Midterm II
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1.
My exam version is:
2.
I need to calculate the relative uncertainty
Δ
D/D
in the distance
D
using the equation
D=x
f
– x
0
. I know the
uncertainties in
x
f
and
x
0
:
Δ
x
f
and
Δ
x
0
. Which formula should I use?
22
00
()
(
)
ff
DD
x x
0
f
D
Dx
x
D
0
f
x
x D
3.
Which of the following is NOT a scalar?
A Work
B Impulse
C Kinetic energy
D Moment of Inertia
Momentum
4.
I’m at rest sitting on an office chair that is able to freely rotate on a vertical axis. I’m holding a rapidly
spinning bicycle wheel over my head so that its rotation axis is pointing upward. Seen from above, the
wheel is rotating clockwise. Now I turn the wheel over without stopping it, so that it now turns
counterclockwise when viewed from above. What happens? When seen from above …
A I start spinning
counterclockwise
I start spinning
clockwise
I remain at rest
D the wheel starts
spinning clockwise
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 Spring '08
 STEPHENS
 Physics

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