6. [-/1 Points] DETAILS SERPSE10 10.3.OP.012. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A car traveling on a flat (unbanked), circular track accelerates uniformly from rest with a tangential acceleration of 2.15 m/s. The car makes it one quarter of the way around the circle before it skids off the track. From these data, determine the coefficient of static friction between the car and track. Need Help? Read It Watch It 7. [-/1 Points] DETAILS SERPSE10 10.7.OP.021. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The four particles shown below are connected by rigid rods of negligible mass where y, = 5.90 m. The origin is at the center of the rectangle. The system rotates in the xy plane about the z axis with an angular speed of 5.70 rad/s. 3.00 kg 2.00 kg O 2.00 kg 4.00 m- 4.00 kg (a) Calculate the moment of inertia of the system about the z axis. kg . m2 (b) Calculate the rotational kinetic energy of the system. Need Help? Read It Watch ItB. l-J'1 Points] I DETAILS SERPSE1010.4.P.014.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER I Find the net torque on the wheel in the figure below about the axle through 0, ta King a = 9.00 cm and b = 25.0 cm. (Assume that the poSitive direction is counterclockwise.) 10.0 N 153.03- 9.003. G) Need Help? El 9. [-11 Points] 5ERPSE1010.5.P.019,CTX. ASK YOUR TEACHER PRACTICE ANOTHER Your grandmother enjoys creating pottery as a hobby. She uses a potter's wheel, which is a stone disk of radius R = 0.550 rn and mass M = 100 kg. In operation, the wheel rotates at 45.0 rev/min. While the wheel is spinning, your grandmother works clay at the center of the wheel with her hands into a pot-shaped object with Circular symmetry. when the correct shape is reached, she wants to stop the wheel in as short a time interval as possible, so that the shape of the pot is not further distorted by the rotation. She pushes continuously with a wet rag as hard as she can radially inward on the edge of the wheel and the wheel stops in 5.00 s. (a) You would like to build a brake to stop the wheel in a shorter time interval, but you must determine the coefcient of friction between the rag and the wheel in order to design a better system. You determine that the maXimurn pressing force your grandmother can sustain for 6.00 s is 60.0 N. (b) What If? If your grandmother instead chooses to press down on the upper surface of the wheel a distance r = 0.250 m from the axis of rotation, what is the force (in N) needed to stop the wheel in 6.00 5? Assume that the coefment of kinetic friction between the wet rag and the wheel remains the same as before. [Enter the magnitude.) |:|N ' lJ #lJ%J Two blocks are connected to a strlng, and the strlng is hung over a pulley connected to the ceiling, as shown in the figure below. G) The masses of the blocks are ml : 16.0 kg and ml2 : 10.0 kg, the mass of the pulley Is M : 5.00 kg, and the radius of the pulley is R : 0.300 m. Block 1112 Is lnitially on the floor, and block m1 is initially 4.80 m above the floor when it is released from rest. The pulley's axis has negligible friction. The mass of the string is small enough to be ignored, and the string does not slip on the pulley, nor does it stretch. (a) How much time (in s) does it take block ml to hit the floor after being released? (b) How would your answer to part (a) change lf the mass of the pulley were neglected? (Enter the time, in seconds, it takes block ml to hit the floor if the mass of the pulley were neglected .) Need Help