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MMLU-Pro / 9886 / The vertical tail propeller on a helicopter prevents the cab from rotating when…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

The vertical tail propeller on a helicopter prevents the cab from rotating when the speed of the main propeller changes. Knowing that the cab has a centroidal moment of in-ertia of 700 lb \textbullet ft \textbullet sec^2 and that the four main blades are 14 ft slender rods weighing 55 lbs, determine the final angu-lar momentum of the cab after the speed of the main blades changes from 200 to 280 rpm. Assume the tail propeller of the helicopter to be inoperational.

category

physics

options

  1. 111.58 lb*ft*sec^2
  2. 2980.6 lb*ft*sec
  3. 357.75 lb*ft*sec^2
  4. 1590.4 lb*ft*sec
  5. 528.8 rpm
  6. -31.15 rpm
  7. 0 lb*ft*sec (no change in angular momentum)
  8. -446.3 lb*ft*sec^2
  9. 446.3 lb*ft*sec^2
  10. 2283.2 lb*ft*sec

src

stemez-Mechanics

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Source and history

upstream_id / Original problem ID
9886
task_id
eaf9d83d-046f-5d3f-8355-ec69b2a0b972
task_key
default--test--9886
task_revision_id
1
config / split
default / test

Official source

initial import