A car of mass m is negotiating a circular turn of radius R and speed v on a banked road with an angle of banking θ. The forces on the car are shown below. Ignore friction in this problem. Draw a free body of the car.
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A car of mass m is negotiating a circular turn of radius R and speed v on a banked road with an angle of banking θ. The forces on the car are shown below. Ignore friction in this problem.
- Draw a free body of the car.
- Identify and show the radial direction. Pick coordinate axes with x pointing in the radial direction towards the center of the circle and y in the vertical direction. Show the coordinate axes on the free body diagram.
- Set up Newton’s Laws in the radial and vertical direction. Which force provides the
centripetal force ? - Use the equations in part C to solve for the speed of the car in terms of R, Does the speed depend on the mass of the car?
- If R=250.0 m, m=750.0 kg, calculate the speed of the car.
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- A 1000 kg car travels around a circular track at a constant speed. Draw the free-body diagram for the car as viewed from the front of the car. If the radius of the path is 200 m and the car is traveling at 25 m/s, What is the magnitude of the force keeping the car in a circular path? (Give answer to 3 sig figs)Questions 5 and 6 refer to the diagram below. m A box of mass m is being pushed up a ramp by a force F acting along the ramp, as shown. The ramp makes an angle to the horizontal, and the coefficient of kinetic friction between the box and the ramp is μ. The normal force and the frictional force exerted on the box are F and f, respectively. 5. Which of the following free-body diagrams correctly shows the forces exerted on the box as it moves up the ramp? (A) (E) FN F F mg mg mg (B) A ohibitedRprint F FN mg Unauthorized copying or reuse of any part of this page is illegal. -8- GO ON TO TI 6. If the force F has a magnitude of 2mg, which of the following is a correct expression for the acceleration of the box? (A) g sine (B) 2g (C) 8 (D) (2-cos@)g (E) g(2 sine cose) - -I Revie A racetrack curve has radius 80.0 m and is banked at an angle of 15.0°. The coefficient of static friction between the tires and the roadway is 0.400. A race car with mass 1200 kg rounds the curve with the maximum speed to avoid skidding. Part A As the car rounds the curve, what is the normal force exerted on it by the road? Express your answer with the appropriate units. ? n = Value Units Submit Request Answer Part B What is the car's radial acceleration? Express your answer with the appropriate units. Arad = Value Units Submit Request Answer
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