103. Speed of a Skidding Car Police use the formula s = V 30fd to estimate the speed s (in mi/h) at which a car is traveling if it skids d feet after the brakes are applied suddenly. The number f is the coefficient of friction of the road, which is a measure of the "slipperiness" of the road. The table gives some typical estimates for f. Tar Concrete Gravel Dry 1.0 0.8 0.2 Wet 0.5 0.4 0.1 (a) If a car skids 65 ft on wet concrete, how fast was it moving when the brakes were applied? (b) If a car is traveling at 50 mi/h, how far will it skid on wet tar?
103. Speed of a Skidding Car Police use the formula s = V 30fd to estimate the speed s (in mi/h) at which a car is traveling if it skids d feet after the brakes are applied suddenly. The number f is the coefficient of friction of the road, which is a measure of the "slipperiness" of the road. The table gives some typical estimates for f. Tar Concrete Gravel Dry 1.0 0.8 0.2 Wet 0.5 0.4 0.1 (a) If a car skids 65 ft on wet concrete, how fast was it moving when the brakes were applied? (b) If a car is traveling at 50 mi/h, how far will it skid on wet tar?
Chapter5: Polynomial And Rational Functions
Section5.8: Modeling Using Variation
Problem 49SE: For the following exercises, use Kepler’s Law, which states that the square of the time, T, required...
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Transcribed Image Text:103. Speed of a Skidding Car Police use the formula
s = V 30fd to estimate the speed s (in mi/h) at which
a car is traveling if it skids d feet after the brakes are
applied suddenly. The number f is the coefficient
of friction of the road, which is a measure of the
"slipperiness" of the road. The table gives some
typical estimates for f.
Tar
Concrete
Gravel
Dry
1.0
0.8
0.2
Wet
0.5
0.4
0.1
(a) If a car skids 65 ft on wet concrete, how fast was it
moving when the brakes were applied?
(b) If a car is traveling at 50 mi/h, how far will it skid on
wet tar?
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