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January 30, 2015

January 30, 2015

Posted by **Chris** on Sunday, May 27, 2012 at 1:41pm.

Point P is at coordinates (1.25,0) and point R is at coordinates (0,1.25). Point Q is directly in the middle of P and R. Can you explain the answers as well so I understand?!

Part C starts with (15.7, ? degrees)

That's all I know.

- PHYSICS PLEASE HELP -
**Elena**, Sunday, May 27, 2012 at 5:36pmLinear velocity is v = ω•R=2•π•n•R =2•π•2•1.25 =15.7 m/s.

The quarter of the circle is covered for the time

t = 2•π•R/4•2•π•n•R =1/8 s =0.125 s.

Displacement for this time is the distance betwee point P and Q

D =sqrt(R² +R²) 1.25•1.41 = 1.76m.

v(ave) =displacement/ time =

1.76/0.125 =14.1 m/s.

(b)

Time for covering the 1/8 part of circle is

t =1/16 =0.0625 s.

Displacement (using cosine law) is

D =sqrt(R² +R² -2 R²cos45º)=0.96 m

v (ave) = 0.96/0.0625 =15.3.

(c)

Instanteneous linear velocity is

v = ω•R=2•π•n•R =2•π•2•1.25 =15.7 m/s.

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