1 . A disk is spinning about its centre at 28.3 revolutions per second. Find the centripetal accelerations of a point 9.2 cm from the centre of the disk 2. A disk is spinning about its centre at 28.3 revolutions per second. Find the speed of a point 9.2 cm from the centre of the disk. 3. A speed boat performing stunts moves in a circular path of radius 60.9 m with a speed of 14.5 m/s. Find the centripetal acceleration of the boat 4. A airplane travelling at a speed of 136.6 m's, has a path that is a horizontal circle of radius 2552.7 m. Find the time the plane takes to complete the circle. 5. Determine the coefficient of static friction required for a car to drive around a flat (unbanked) roundabout of radius 57.7 m at speed of 45.3 km/h without skidding or slipping. 6. If a car is to safely negotiate a curve of radius 91.8 m at a top speed of 84.0 km/h, find the banking angle (in degrees) that will allow the car to do so independent of friction. 7. A stone of mass 0.61 kg is tied to a string of length 0.46 m and whirled around in a vertical circle. If the speed of the stone is 10.623205124334 m/'s, find the tension in the string at the bottom of the circle. 8. A stone of mass 0.61 kg is tied to a string of length 0.46 m and whirled around in a vertical circle. If the speed of the stone is 10.623205124334 m/'s, find the tension in the string at the top of the circle. 9. An exoplanet is one that is outside the solar system. One such plant is found to have a radius of 8.6 times that of Earth and mass 1.9 times that of earth. Find the acceleration due to gravity at the planet's surface. 10. A satellite is in a circular orbit a distance 15193.9 km above the Earth's surface. Find the period of rotation of the satellite in hours. Earth Radius: 6.37156 m Earth Mass: 5.972E24 kg 11. A satellite is in a circular orbit a distance 9048.8 km above the Earth's surface. Find the speed of rotation of the satellite. Earth's Radius: 6.37156 m Earth's Mass: 5.972E24 kg