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4. The coefficient of static friction between a tire and a certain road is 0.70.
(a) What is the maximum possible acceleration of a car on this road?

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4. You are pushing horizontally with a 300 N force on a box that is on an inclined plane as shown. The mass of the box is 30 kg and the incline is at a 25 degree angle off the Fapplied horizontal. The coefficient of kinetic friction between the box and the incline is 0.3, and the coefficient of static friction i 0.4. Assuming the box was at rest at t=0 when the force is initially applied, is the box moving up the ramp, down the ramp, or is it at rest after the force has been applied? 25⁰
3. A car of mass m is traveling along a circular track of radius r with a constant speed v. Determine the minimum coefficient of static friction between the tires and the track required for the car to remain in circular motion if: a. the track is flat. b. the track has an angle
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5. A box of mass m = 5kg is sliding with constant velocity down an incline that makes an angle of 0 = 30° with the horizontal. The coefficient of static friction is s = 0.75 and the coefficient of kinetic friction is μ = 0.5. What is the magnitude of the friction?
9. A 75 N crate is at rest on an incline that is inclined a 25° above the horizontal. The coefficient of static friction between the crate and the incline is 0.25 and the coefficient of kinetic friction between the crate and the incline is 0.15. (a) What is the minimum magnitude of a force parallel to the incline that will prevent the crate from sliding down the incline? (b) What is the minimum magnitude of the force parallel to the incline that will start the crate to move up the incline? (c) Include a force (or free body) diagram of each situation.
2. You place a crate of mass 37.0 kg on a frictionless 4.65-meter-long incline. You release the crate from rest, and it begins to slide down, eventually reaching the bottom 1.37 s after you released it. What is the angle of the incline? 42.4 degrees 55.1 degrees 36.4 degrees 30.3 degrees
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4. A 50.0-kg crate is being pulled along a horizontal smooth sSurface. The pulling force is 10.0 N and is directed 20.0° above the horizontal. What is the magnitude of the acceleration of the crate? A) 0.0684 m/s2 B) 0.188 m/s2 C) 0.200 m/s2 D) 0.376 m/s2 E) 0.0728 m/s2 Final formula: Required steps: 1) Draw free body diagram 2) Choose reference frame 3) Find vectors components 4) Apply Newton's 2nd law 5) Solve for a algebraically 6) Check units 7) Substitute numerical values