1.A seesaw with mass M = 20 kg and length L = 8 m is supported at its center. (Treat the seesaw as a uniform bar.) On the seesaw, a block with mass m1 = 5 kg is placed 2 m left of center. and another block with mass m2 = 2 kg is placed 4 m right of center. Draw a diagram of the problem. including known variables and a coordinate system. 0 Explain the concept of rotational equilibrium in terms of torque, using at least three sentences. Determine the torque caused by each block individually. Calculate the angular acceleration of the bar. Determine the time required for the bar to rotate 1 radian. 2. A tennis ball (hollow sphere) with mass M = 0.06 kg and radius R = 0.035 m starts on the ground with initial speed v0 = 3.5 m/s. It travels up a hill with height d = 0.5 m, then it continues horizontally at that height. Assume all motion is rolling without slipping. Draw a diagram of the problem, including known variables and a coordinate system. Explain the importance of rolling without slipping for kinetic energy. using at least three sentences. Calculate the initial angular speed wO before the ball travels up the hill. Determine the total energy of the ball before it begins traveling up the hill.' Calculate the kinetic energy of the ball at the top of the hill