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Physics: strange vector hw problem

  • Thread starter oldunion
  • Start date
  • #1
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The minute hand on a watch is 2.0cm in length. What is the displacement vector of the tip of the minute hand?

from 8-8:20 am.

Express vector DeltaR in the form DeltaR_x, DeltaR_y, where the x and y components are separated by a comma.

I thought i had it with the answer of 3.4 cm, but they want it in x and y components :confused: its a circle! My book has nothing for me and im significantly lost.
 

Answers and Replies

  • #2
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The displacement vector points from the starting location to the final location, it is a straight line. It's just an arrow pointing from start to finish, break this vector into components.
 
  • #3
andrevdh
Homework Helper
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Draw the displacement vector from the tip of the minute hand at 8:00 to the tip of the minute hand at 8:20.
 
  • #4
HallsofIvy
Science Advisor
Homework Helper
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Actually it might be simplest to do this in components. The "components" of the minute hand at 8:00 are easy. What angle does the minute hand make with the horizontal at 8:20? (Hint: the minute hand move 360 degrees in an your and 5 minutes is 5/60= 1/12 of an hour. How many degrees does the minute hand move in 5 minutes? Why is "5 minutes" important here?)
 

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