11. Proper storage of hay bales is essential for the survival of cattle during Canadian winters. A farmer uses a cable to exert an upward pull of 850 N on an 81.6 kg bale of hay. a. Draw a free-body diagram of the bale slowly accelerating upwards. [Appendix A] b. Determine the magnitude of the bale's acceleration. [0.607 m/s-] 12. A 290 g mass on a spring scale is suspended in an elevator and the elevator starts moving up resulting in the scale reading shown in the diagram. Determine the magnitude of the elevator's acceleration if the spring scale is calibrated in units of newtons. [~1.2 m/s ] N - O 5 290 g 13. The greatest velocity at which an object will fall is called terminal velocity. This occurs when the downward force of gravity is equal in magnitude to the upward force caused by air resistance. a. Label force arrows on the free-body diagram of an object falling at its terminal velocity as shown to the right. [Appendix A] b. Calculate the force due to air resistance for a 2.00 kg mass falling at its terminal velocity. [19.6 N]