Consider a particle moving at a constant speed in a straight line with no forces acting on it. For an arbitrary observer located at a fixed point O, show mathematically that an imaginary line joining the observer to the particle sweeps out equal areas in equal time intervals.

Classical Dynamics of Particles and Systems
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ISBN:9780534408961
Author:Stephen T. Thornton, Jerry B. Marion
Publisher:Stephen T. Thornton, Jerry B. Marion
Chapter8: Central-force Motion
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Problem 8.9P
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Areas and circular motion


A) Consider a particle moving at a constant speed in a straight line with no
forces acting on it. For an arbitrary observer located at a fixed point O, show mathematically that an imaginary line joining the observer to the particle sweeps out equal areas in equal time intervals.

B) Consider now instead a particle following a circular trajectory with constant angular velocity and an observer at the centre of the circle. Show that the imaginary line that joins the observer to the particle sweeps out equal areas in equal times.

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