A 900 g ball moves in a vertical circle on a 1.09 m-long string. If the speed at the top is 4.80 m/s, then the speed at the bottom will be 8.11 m/s. H Revi Part B What is the tension in the string when the ball is at the top? Express your answer with the appropriate units. > View Available Hint(s) HA ? Trop Value Units Submit Previous Answers X Incorrect; Try Again; 3 attempts remaining Part C What is the tension in the string when the ball is at the bottom? Express your answer with the appropriate units. > View Available Hint(s) HA Thottom = Value Units
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- A wind turbine has 12,000 kg blades that are 37 m long. The blades spin at 22 rpm. Part A If we model a blade as a point mass at the midpoint of the blade, what is the inward force necessary to provide each blade's centripetal acceleration? Express your answer with the appropriate units. F= Valye HÅ Submit Request Answer Provide Feedback G → Units ? NA 300 g ball on a 70-cm-long string is swung in a vertical circle about a point 200 cm above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height 600 cm above the floor. Part A What was the tension in the string an instant before it broke? Express your answer to two significant figures and include the appropriate units. HÅ T = Value Submit Request Answer 0 ? UnitsUnder good conditions, a car can travel at a maximum speed of vmax around a particular unbanked curve. In the aftermath of an ice storm, however, driving at that same speed will cause the car to slide off the road. Which of the statements below best describes why this is true? a. The friction force is no longer strong enough to balance the centripetal force and give the car zero acceleration. b. The friction force is needed to do negative work on the car to reduce the car’s kinetic energy. c. The friction force no longer provides a strong enough unbalanced force to change the car’s velocity quickly enough to stay on the curve. d. The car “floats” on the ice reducing the gravitational force which is what keeps the car on the road. e. [All of the above.]
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