If the man pulls the strap with constant acceleration during a short time interval Δt, calculate the force (in Newtons) that he must exert in spinning up the disc.  These are the numbers. Strap's final speed = v = 1.9 m/s. The disc's radius is R = 0.4 m The disc's mass is M = 2.4 kg The short time interval is Δt = 0.3 s The disc initially is non-rotating.

Glencoe Physics: Principles and Problems, Student Edition
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ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter6: Motion In Two Dimensions
Section: Chapter Questions
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If the man pulls the strap with constant acceleration during a short time interval Δt, calculate the force (in Newtons) that he must exert in spinning up the disc.  These are the numbers.

  • Strap's final speed = v = 1.9 m/s.
  • The disc's radius is R = 0.4 m
  • The disc's mass is M = 2.4 kg
  • The short time interval is Δt = 0.3 s
  • The disc initially is non-rotating.
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