Physics 250 final exam with detailed answers
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Consider |two |children |sitting |on |a |merry-go-round, |with |one |closer |to |the |outer |edge |and |one |closer |
to |the |center.
Which |child |has |a |greater |angular |speed? |- |ANSWER-They |both |have |the |same |angular |speed
There |are |two |kinds |of |acceleration |that |can |occur |in |rotational |motion |- |tangential |and |centripetal.
What |best |describes |the |difference |between |these |two |kinds |of |acceleration? |- |ANSWER-Centripetal |
acceleration |is |towards |the |center, |while |tangential |is |along |the |edge |of |the |circle.
Two |ladybugs |of |the |same |mass |are |on |a |record |that |is |on |a |record |player. |The |record |player |is |
turned |on |and |it |reaches |a |constant |velocity.
If |the |male |ladybug |is |all |the |way |at |the |edge |and |the |female |ladybug |is |halfway |between |the |center |
and |the |edge, |what |can |be |said |about |their |moments |of |inertia? |- |ANSWER-The |male |ladybug's |
moment |of |inertia |is |four |times |that |of |the |female's.
An |ice |skater |is |spinning |with |her |arms |out |and |is |not |being |acted |upon |by |an |external |torque.
When |she |pulls |her |arms |in |close |to |her |body |what |happens |to |her |angular |momentum? |- |ANSWER-It
|remains |unchanged
An |ice |skater |is |spinning |with |her |arms |out |and |is |not |being |acted |upon |by |an |external |torque.
When |she |pulls |her |arms |in, |what |happens |to |her |moment |of |inertia? |- |ANSWER-It |decreases
An |ice |skater |is |spinning |with |her |arms |out |and |is |not |being |acted |upon |by |an |external |torque.
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Consider |two |children |sitting |on |a |merry-go-round, |with |one |closer |to |the |outer |edge |and |one |closer |
to |the |center.
Which |child |has |a |greater |angular |speed? |- |ANSWER-They |both |have |the |same |angular |speed
There |are |two |kinds |of |acceleration |that |can |occur |in |rotational |motion |- |tangential |and |centripetal.
What |best |describes |the |difference |between |these |two |kinds |of |acceleration? |- |ANSWER-Centripetal |
acceleration |is |towards |the |center, |while |tangential |is |along |the |edge |of |the |circle.
Two |ladybugs |of |the |same |mass |are |on |a |record |that |is |on |a |record |player. |The |record |player |is |
turned |on |and |it |reaches |a |constant |velocity.
If |the |male |ladybug |is |all |the |way |at |the |edge |and |the |female |ladybug |is |halfway |between |the |center |
and |the |edge, |what |can |be |said |about |their |moments |of |inertia? |- |ANSWER-The |male |ladybug's |
moment |of |inertia |is |four |times |that |of |the |female's.
An |ice |skater |is |spinning |with |her |arms |out |and |is |not |being |acted |upon |by |an |external |torque.
When |she |pulls |her |arms |in |close |to |her |body |what |happens |to |her |angular |momentum? |- |ANSWER-It
|remains |unchanged
An |ice |skater |is |spinning |with |her |arms |out |and |is |not |being |acted |upon |by |an |external |torque.
When |she |pulls |her |arms |in, |what |happens |to |her |moment |of |inertia? |- |ANSWER-It |decreases
An |ice |skater |is |spinning |with |her |arms |out |and |is |not |being |acted |upon |by |an |external |torque.
