17 of 22> K) 17 of 22 ± Banked Frictionless Curve, and Flat Curve with Friction

Question

17 of 22> K) 17 of 22 ± Banked Frictionless Curve, and Flat Curve with Friction What is the radus r of the turn if -20 0° (assuming the car continues in uniform circular motion arond the tum)? Express your answer in meters A car of mass M 1400kg traveling at 65.0 km/hour enters a barked turn covered with ice. The road is banked at an angle 0, and there is no friction betwoon the road and the car's tires as shown in (Figure 1). Use g- 9.80 m/s throughout this problem. View Avallablo Hint(s) 91.4 m Part B Now, suppose that the curve is level (-0) and that the ice has melled, so that there is a coefficient of static friction between the road and the car's tires as shown in (Figure 2). What is Amia, the minimum value of the ccefficent of static friction between the tires and the road required to prevent the car from sipping? Assume that the car's spoed is sill 65.0 km/hour and that the radius of the curve is 91.4 m Express your answer numerically Figure 1 of 2> View Available Hint(s) H5446 Submit X Incorrect Try Again Provide Feecback Next >

Explanation / Answer

a) Work done = Area of the F-x graph

= 0.6*0.25 + 0.4*0.25 + 0.8*0.25

= 0.45 J

b) work done from x = 0.2 to x = 0.65

= 0.6*(0.25-0.2) + 0.4*(0.25) + 0.8*(0.65-0.5)

= 0.25 J

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