Box final answers

Level I The diagram shows a stone tied to the end of a length of string. It is whirled round in a horizontal circle of radius 80 cm. string 80cm 90g stone This is er circ of to The stone has a mass of 90g and it completes 10 revolutions in a time of 8.2s. a Calculate: i the time taken for one revolution; [1] ii the distance travelled by the stone during one revolution; [1] ifi the speed of the stone as it travels in the circle; iv the centripetal acceleration of the stone; [3] the centripetal force on the stone. (2] b What provides the centripetal force on the stone? [1] e What is the angle between the acceleration of the stone and its velocity? [1] Level II 7. An object is traveling in a circular path whose radius is 65m. Its acceleration is 3.0 m/s. What is its velocity? 8. An object is traveling with a velocity of 6.0 m/s in a circular path. It's acceleration is 3.0 m/s'. What is the radius of its path? Level III 9. An object is traveling in a circle with a radius of 2m at a period of 4s. Find its acceleration. 10. An object is traveling in a circular path whose radius is 65m. Its acceleration is 3.0 m/s. What is the period of its motion