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January 29, 2015

January 29, 2015

Posted by **pam** on Wednesday, July 18, 2012 at 2:51am.

- physics -
**bobpursley**, Wednesday, July 18, 2012 at 3:46amdraw the right triangle. Let L be the horizontal length from the base of the tower.

If Theta is the angle of depression from the horizontal (check your drawing), then

Using some geometry, it must be the same angle of the angle of elevation from the car.

TanTheta=40/L

L sinTheta=40 cosTheta

taking the derivative..

SinTheta dL/dt+LcosTheta dTheta/dt=-40sinTheta dTheta/dt

Now, the question asks you to solve dL/dt when Theta=45deg and dTheta/dt=.16

L must = 40 also when theta=45 deg, so you have enough to solve it.

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