p11_009.pdf
(
75 KB
)
Pobierz
Chapter 11 - 11.9
9. We assume the sense of initial rotation is positive. Then, with
ω
0
>
0and
ω
= 0 (since it stops at time
t
), our angular acceleration is negative-valued.
(a) The angular acceleration is constant, so we can apply Eq. 11-12 (
ω
=
ω
0
+
αt
). To obtain the
requested units, we have
t
=30
/
60 = 0
.
50min. Thus,
α
=
−
33
.
33rev
/
min
0
.
50min
=
−
66
.
7rev
/
min
2
.
(b) We use Eq. 11-13:
2
αt
2
=(33
.
33)(0
.
50) +
1
2
(
−
66
.
7)(0
.
50)
2
=8
.
3rev
.
θ
=
ω
0
t
+
1
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p11_060.pdf
(73 KB)
p11_002.pdf
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p11_001.pdf
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p11_005.pdf
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p11_003.pdf
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Inne foldery tego chomika:
chap01
chap02
chap03
chap04
chap05
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