Problems ( 10 pts./each) 1. Three blocks m, 25kg, m2 13kg and m 19kg are connected together in order. A force of F1 =5N is applied to the m, block to the left and F to the right. (Diagram below.) 5N is applied to m, pushing a). What is the acceleration of the blocks? b). What is the force on m, by m? c). What is the force on m2 by m, and m,? (Diagram below.) F2 Ma M2 M1 2. A block of mass 20 kg sitting on a horizontal surface is being pulled by a force of 6N with an acceleration of 0.2 m/sec? a). What is the force of friction on the block? b). Is the frictional force static or kinetic? c). What is the value of the coefficient of friction? 3, A spring of constant k=3N/m is compressed from equilibrium by-2m. a). What is the force of the spring? b).What is the potential energy in the spring? c). If the spring is released what will be the kinetic energy of an object of mass 2kg attached to the spring? 4. A force of 23N is applied at an angle of 46° to a box of mass 8kg while another force of 9N is applied at an angle of 160° to the box. If the displacement of the box is Ar 8.5mi+ 4mj then: a). What is the resultant force? b). What is the total work by the force? c). If the box is moved to its final position in 2 minutes, then what is the average power? 5. A planet of mass 4.6 x 101 kg is moving in a circle of radius 3 x 10′ km with a constant speed a). If it takes the planet 202 days to complete one orbit what is its speed? b). What is the centripetal acceleration of the planet? c). What is the planet’s centripetal force?