hello I need help solving those questions please

0 a A thin rod, 26.7cm long with a mass of 1.29kg, has a ball with diameter 7.99cm and mass 2.11kg attached to one end. The arrangement is originally vertical and stationary, with the ball at the top. The apparatus is free to pivot about the bottom end of the rod. After it falls through 90, what is its rotational kinetic energy? Submit Answer Tries 0/10 What is the angular speed of the rod and ball after it has fallen through an angle of 90? Submit Answer Tries 0/10 What is the linear speed of the center of the ball after falling through an angle of 90? Submit Answer Tries 0/10 What would have been the speed of the ball if it had freely fallen through a distance of 30.7cm? Submit Answer Tries 0/10 0 a, The block ml with mass 16.7kg and the block m2 with mass 6.30kg are suspended by a pulley that has a radius of 10.0cm and a mass of 6.90kg, as seen in the figure below. The cord has a negligible mass and causes the pulley to rotate without slipping. The pulley rotates without friction. The masses start from rest d=4.00m apart. Treating the pulley as a uniform disk, determine the speed of the blocks as they pass each other. Submit Answer Tries 0/10 it W. C "'2 0 e A 7.93kg bag of hammers rests on a spring which is compressed 9.9cm by the weight of the bag. What is the spring constant? Submit Answer Tries 0/10 If the bag of hammers is pushed down by an additional 30.8cm and is then released, what is the elastic potential energy just prior to release? Submit Answer Tries 0/10 What is the change in gravitational potential energy when the bag moves from the point of release to its maximum height? Submit Answer Tries 0/10 What is the maximum height reached by the bag of hammers, as measured from the point of release? \"a A 2.18kg rock is dropped onto a spring from a height of 0.406m. If the spring constant is 1979N/m, what is the maximum compression of the spring? Submit Answer Tries 0/10 "a 2. A force acting on a particle moving in the xy plane is given by F = (2.50 yi + 1.10x2 j)N, where x and y are in meters. The particle moves from the origin to a nal position having coordinates x = 4.02m and y = 4.02m, as seen in the figure below. V O A 2a. Calculate the work done by F along OAC. Submit Answer Tries 0/10 2b. Calculate the work done by F along OBC