show work and notes

7. A motorcyclist wants to cross a space at a velocity of 130 km/h. If the space is 30 m. What is the angle of the ramp? What is the maximum height of his motorcycle? 8. " A 300 g rock is attached to a 125 cm string. During horizontal rotation, find the velocity of the rock if it makes 20 revolutions in 5.2 seconds. Find the tension in the string (in Newtons) 9. A 700 kg car is taking a circular track with a 50 m radius and it takes 14.3 seconds to travel at uniform speed one complete circle. What is the acceleration of the car? What average force must the track exert on the tires to produce this acceleration? What would be his maximum velocity before skidding if the coefficient of friction is 0.55