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- A car initially traveling eastward turns north by traveling in a circular path at uniform speed as shown in Figure P7.15. The length of the arc ABC is 235 m, and the car completes the turn in 36.0 s. (a) Determine the cars speed. (b) What is the magnitude and direction of the acceleration when the car is at point B? Figure P7.159. A particle moves at a constant speed in a circular path with a radius of 2.06 cm. If the particle makes four revolutions each second, what is the magnitude of its acceleration? C. 13 m/s D. 15 m/s A. 20 m/s B. 18 m/s O A OD O B3. A dog initially at rest, starts running inside a circular track with a 40n m circumference. The dog's acceleration tangent to its path is defined by the function at = 0.1t + 0.4t. What is the total distance ran by the dog after t= 10 s?
- Kinematics 2: Motion in 2-Dimensions and ons 19. An object is moving in a uniform circular motion. True or False? The linear velocity of the object is constant. 25. An 20. An object is moving in a uniform circular motion. True or False? The centripetal accelerationn is equal to-g. ur re 21 An object is moving in a uniform circular motion. True or False? The direction of the centripetal acceleration is always towards the center 26 22. An object is moving in a uniform circular motion. True or False? rad/s is a unit of angular frequency.28. An airplane makes a gradual (90° turn while flying at a constant speed of 200 m/s. The process takes 20.0 seconds to complete. For this turn the magnitude of the average acceleration of the plane is: А. zero 2 Tir B. 40 m/s C. 20 m/s D. 14 m/s E. 10m/s? 2 20 2 ir 200 ans: D 4o00 = 2ir r= 637 29. An airplane is flying north at 500 km/h. It makes a gradual 180° turn at constant speed, changing its direction of travel from north through east to south. The process takes 40 s. The average acceleration of the plane for this turn (in km/h-s) is: A. 12.5 km/h·s, north B. 12.5 km/h·s, east C. 12.5 km/h·s, south D. 25 km/h s, north E. 25 km/h s, south ans: EAn aircraft performs a maneuver called an aileron roll. During this maneuver, the plane turns like a screw as it maintains a straight flight path, by using its ailerons to set the wings in circular motion. If it takes the plane 35s to complete the circle and each wing length is 4.6m, what is the acceleration of the wing tip? O A. 0.69 mis? OB.0. 15 m/s? OC14 mis? OD.6.7 mis?
- A toy car moves around a circular track at constant speed. It suddenly doubles its speed. As a result, the centripetal acceleration changes by a factor of A. 4 B. 2 C. 1/2 D. No change since the radius doesnt change33. A curve on a highway has a radius of curvature of 200.0 m. What is the magnitude of a car’s centripetal acceleration as it travels along this curve at a constant speed of 26.8 m/s in 4.00 s?A. 0 m/sB. 0.134 m/sC. 3.59 m/sD. 6.70 m/sAn aston martin v8 vantage sports car has a "lateral acceleration" of 9/ms2. This is the maximum centripetal acceleration the car can sustain without skidding out of a curved path. If the car is travelling at a constant 48 m/s on level ground, what is thr radius R of the tightest unbanked curve it can negotiate?
- 2. A girl jogs around a horizontal circle with a constant speed. She travels one half of a revolution, a distance of 20.0 m along the circumference of the circle, in 8.00 s. a. What is the radius of the circle in meters? b. What is the period? c. What is her speed? d. What is her radial acceleration is?A motorboat travels along a circular path with the radius equal to 50m. It starts from rest and moves at a speed v = 0.8t misec, where it is ins Seconds. Determine the magnitude of the boat's n acceleration when it has traveled 20m in m/sec².lov xtonl S 20012000 920 9 bras o gvery, Ex < So roz5. A car is driving at a speed of 80mph in a circular track with radius of 1500ft. The driver applied brakes to decelerate the car and after 6 seconds, the speedvdecreases to half the original speed. What is the acceleration of the car at the instant after the brakes have been applied? a. 9.18 ft/s2 b. 9.78 ft/s2 c. 13.4ft/s2 d. 14.3ft/s2