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MMLU-Pro / 9394 / Delivery trucks which operate by making use of the energy stored in a rotating…

Problem

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question

Delivery trucks which operate by making use of the energy stored in a rotating flywheel have been in use for some time in Germany. The trucks are "charged up" before leaving by using an electric motor to get the flywheel up to its top speed of 6000 rev\bulletmin^-1. If one such flywheel is a solid homogeneous cylinder of weight 1120 lb and diameter 6 ft, how long can the truck operate before returning to its base for "recharging\textquotedblright, if its average power requirement is 10 hp?

category

physics

options

  1. 80 min
  2. 105 min
  3. 75 min
  4. 120 min
  5. 70 min
  6. 110 min
  7. 85 min
  8. 94.2 min
  9. 100 min
  10. 130 min

src

stemez-Physics

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