Question: A skater can spin faster by pulling her arms closer to her body or spin slower by spreading her arms out from her body. This is due to
Answer:
the law of gravity.
Newton's third law.
conservation of momentum.
conservation of angular momentum.
conservation of energy.
The correct answer is:
conservation of angular momentum.
When a skater pulls her arms closer to her body, she reduces her moment of inertia, which causes her angular velocity to increase in order to conserve angular momentum. Conversely, when she spreads her arms out from her body, her moment of inertia increases, causing her angular velocity to decrease to conserve angular momentum. This phenomenon is described by the principle of conservation of angular momentum.
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Insert the missing elements (marked by sign "?") in the sequences shown, making assumptions about the rules for forming these sequences.
0 1 2 3 4 ? 6 7 8 9
a b c d e ? g h i j
0 2 4 6 8 ? 12 14 16 18
0 1 4 9 16 ? 36 49 64 81
0 3 6 9 12 ? 18 21 24 27
0 -2 -2 0 4 ? 18 28 40 54
Su Mo Tu We Th ? Sa
z o t t f ? s s e n
1 0 0 0 1 ? 1 0 2 1
M V E M J ? U N
c u d t c ? s s o n
0 1 3 6 10 ? 21 28 36 45
r o y g ? i v
1 1 2 6 24 ? 720 5040 40320 362880
1 9 36 ? 126 126 ? 36 9 1
G X U V I ? R L
da h k M G ? P E Z Y
d c m μ n ? f a z y
o t h t m ? t q q s
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