105
20b)
Example 5.11 A circular racetrack of
radius 300 mis banked at an angle of 15°
If the coefficient of friction between the
wheels of a race-car and the road is 0.2,
what is the (a) optimum speed of the race-
car to avoid wear and tear on its tyres, and
(b) maximum permissible speed to avoid
slipping?
Answer On a banked road, the horizontal
entfuhanormal forn a
1
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