4. In the figure we see two blocks connected by a string and tied to a wall, with 0 = 34.0. The mass of the lower block is m = 1.35 kg; the mass of the upper block is 3.50 kg. Find the tension in the string that is tied to the wall. N 5. A child slides down a slide with a 290 incline, and at the bottom her speed is precisely one-third what it would have been if the slide had been frictionless. Calculate the coefficient of kinetic friction between the slide and the child. 6. A mass m1 = 4.80 kg block on a tabletop is attached by a string to a hanging block of mass my = 2.40 kg, as shown in the figure. The coefficient of kinetic friction between the mass (m1) and the surface is 0.19. The blocks are released from rest and allowed to move freely. Find the magnitude of the tension in the string. N7. A 7.50 kg block is pressed against a vertical wall by a force ( F), as shown in the figure below. The coefficient of static friction between the block and the wall is 0.34 and the directional angle 0 for the force is 34.0. Determine the magnitude of the force ( F) when the block is about to slide down the wall. N F 8. The system shown in the following figure is in static equilibrium and the angle 0 = 34.0. Given that the mass m1 is 8.30 kg and the coefficient of static friction between mass m, and the surface on which it rests is 0.31, what is the minimum mass that my can have for which the system will still remain in equilibrium? kg9. A 37.0 kg box is being pushed by a person across a horizontal floor with a force F = 135 N that makes an angle 0 = 29.0 with the horizontal as shown in the figure. What is the magnitude of the acceleration of the box if the coefficient of kinetic friction between the box and the floor is 0.21? m/$2 10. According to Newton's third law, what is the reaction force in the previous question to the normal force of the floor on the person? O The normal force of the floor on the box O The weight of the box O The gravitational pull of the box on Earth The weight of the person O The force of the box on the person The normal force of the box on the floor O The normal force of the person on the floor The force of the person on the box The gravitational pull of the person on Earth