ch16-p085 - 85. (a) With length in centimeters and time in...

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85. (a) With length in centimeters and time in seconds, we have 60 cos 4 . 8 dy x ut dt π §· == π π ¨¸ ©¹ Thus, when x = 6 and 1 4 t = , we obtain 60 60 cos 133 4 2 u −π π =− π = =− so that the speed there is 1.33 m/s. (b) The numerical coefficient of the cosine in the expression for u is –60 π . Thus, the maximum speed is 1.88 m/s. (c) Taking another derivative,
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This note was uploaded on 04/16/2011 for the course PHYSICS 191262 taught by Professor Najafzadeh during the Spring '09 term at The Petroleum Institute.

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