Rotational-Mechanics.Angular-Momentum.MS.KC.3: A well oiled merry-go-round (hori
ID: 777552 • Letter: R
Question
Rotational-Mechanics.Angular-Momentum.MS.KC.3: A well oiled merry-go-round (horizontal disk) is rotating with a girl walking from the outside edge towards the middle. Which of the follow- ing statements are true regarding this situation? (a) The rotational velocity of the girl merry-go-round system remains constant. ) The rotational velocity of the girl increases (b) The angular momentum of the merry-go-round increases (c) The angular momentum of the girl merry-go-round system increases (e) The kinetic energy of the girl + merry-go-round system increases. () The kinetic energy of the merry-go-round remains constant.Explanation / Answer
(a) FALSE, since rotational velocity is not a conserved quantity.
(b1) TRUE, since overall angular momentum should be conserved, this increases the angular velocity of the merry -go round which increases the rotational velocity of the girl.
(b2) FALSE, angular momentum is conserved.
(c) FALSE, angular momentum of the system does not change.
(e) FALSE, Kinetic energy is a conserved quantity.
(f) FALSE, Kinetic energy of the merry-go-round+ girl remains constant.
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