A car is approaching a wall at a speed of 27.1 m/s.  If the distance d is 100 m,     a.  Determine the friction coefficient required to stop the car before it hits the wall. b. Determine the friction coefficient necessary for the car to avoid the wall by turning (not braking) and following the circular path shown.  (friction supplies the centripetal force)

A ball of mass 0.15 kg is attached to the end of 1.1 m long cord. The ball is swung in a vertical circle. Determine the minimum speed (in m/s) of the ball at the top of the motion so that the ball continues moving in a circle. a. 2.1 b. 4.5 c. 3.3 d. 1.7

Rising fast ball. A batter in a baseball game will sometimes describe a pitch as being a rising ball, termed a hop. Although technically possible, such upward motion would require a large backspin on the ball so that an aerodynamic force would lift the ball. More likely, a rising ball is an illusion stemming from the batter's misjudgment of the ball's initial speed. The distance between the pitching rubber and home plate is 60.5 ft. If a ball is thrown horizontally with no spin, how far does it drop during its flight if the initial speed vo is (a) 36 m/s (slow, about 80 mi/h) and (b) 43 m/s (fast, about 95 mi/h)? (c) What is the difference in the two displacements? (d) If the batter anticipates the slow ball, will the swing be below the ball or above it? (a) Number i (b) Number (c) Number (d) MO Units Units Units

Q1. A 2 kg bob moves along a circular path in the vertical plane. When the bob is at the highest point, the bob has a speed of 6 m/s. Determine the tension in the cord at this moment 2m