Friday

January 30, 2015

January 30, 2015

Posted by **Anonymous** on Saturday, June 2, 2012 at 5:05pm.

(a) Using a scale of 1cm to represent 40m, draw a diagram to show the positions of P, Q and R in the space provided below.

(b) Determine :

(i) the distance of R from Q;

(ii) the bearing of R from Q

(c) A vertical post stands at P and another one at Q. A bird tales 18 seconds to fly directly from the top of the post at Q to the top of the post at P. Given that the angle of depression of the top of the post at P from the top of the post at Q is 9°

Calculate;

(i) The distance, to the nearest meter, the bird covers;

(ii) The speed of the bird in km/h

- math -
**Steve**, Saturday, June 2, 2012 at 5:31pmif P is at (0,0), then we have

Q: (-184,-154)

R: (120,0)

so, RQ = 341

bearing = 180° + arctan(304/154) = 243°

- math -
**Steve**, Saturday, June 2, 2012 at 5:37pmd = 341/cos9° = 345m

speed = 345m/18s * 1km/1000m * 3600s/hr = 69km/hr

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