Posted by **Anonymous** on Wednesday, August 29, 2012 at 9:22pm.

One afternoon, a couple walks three-fourths of the way around a circular lake, the radius of which is 1.03 km. They start at the west side of the lake and head due south to begin with. (a) What is the distance they travel? (b) What is the magnitude of the coupleâ€™s displacement? (c) What is the direction (relative to due east) of the coupleâ€™s displacement?

- physics -
**Elena**, Thursday, August 30, 2012 at 5:25am
Distance=0.75• 2•π•R=0.75•2•π•1.03=4.85 km.

Displacement is =2√R=2√1.03=2.03 km

direction 45ºrestectively - x-axis direction

or 135º respectively +x-direction

- physics -
**Rein**, Tuesday, September 18, 2012 at 3:20pm
Displacement is 1.03^2*1.03^2=c^2 the third side is your displacement

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