A ball is rolling up on an inclined plane without slipping, reaches some height, and then rolls down. What is the direction of the force of friction acting on the ball? Downwards, while ascending as well as descending Downwards, while ascending and upwards, while descending Upwards, while ascending as well as descending Upwards, while ascending and downwards, while descending
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- An object of mass m, = 4.60 kg is connected by a light cord to an object of mass m, = 3.00 kg on a frictionless surface (see figure). The pulley rotates about a frictionless axle and has a moment of inertia of 0.520 kg m and a radius of 0.290 m. Assume that the cord does not slip on the pulley. 2 T2 (a) Find the acceleration of the two masses. m/s2 (b) Find the tensions T, and 12 T. T = T2 =A sphere of mass 4.66 kg and radius 8.60 cm is moving on a flat surface at a constant speed of 12.5 m/s. If the surface turns to a ramp, how high will the sphere roll?A student places a coin on a flat disk. The flat disk is allowed to rotate around an axis through its center. The angular velocity of the flat disk gradually increases. The coin initially rotates with the disk but eventually slides off the disk. Which of the following is the best explanation for the coin's behavior? The kinetic friction was no longer large enough to provide the necessary angular acceleration The kinetic friction was no longer large enough to provide the necessary centripetal acceleration The static friction was no longer large enough to provide the necessary angular acceleration The static friction was no longer large enough to provide the necessary centripetal acceleration
- A tennis ball, starting from rest, rolls down the hill in the figure. At the end of the hill the ball becomes airborne, leaving at an angle of 35° with respect to the ground. Treat the ball as a thin-walled spherical shell, and determine the range x. Number i eTextbook and Media Save for Later 12 W S #3 1.8 m 135 Units Attempts: 0 of 3 used Submit Answer APR 2 tv I all A 80 F3 a F4 E $ 14 95 F5 MacBook Air % 50 6 C F6 27 & < F7 R T Y U D F G H * 00 8 DII F8 D F9 ( 9 O A F10 F11 t O { P [ J K L X C V B N M H command ? H command optionQ 5The photograph shows a girl pushing on a large stone sphere. The sphere has a mass of 8200 kg and a radius of 90 cm. Suppose that she pushes on the sphere tangent to its surface with a steady force of 50 N and that the pressured water provides a frictionless support. How long will it take her to rotate the sphere one time, starting from rest?