Example # 1. Find the tension FT in the horizontal cable. 40 ..., Exercises of Physics

Download Example # 1. Find the tension FT in the horizontal cable. 40 ... and more Exercises Physics in PDF only on Docsity! Example # 1. Find the tension FT in the horizontal cable. 40° FT = ? 58.0 kg Example #2. In this case, the left cable is strong, but the right cable can only handle a maximum 60° 25° tension of 5.0 x 10 2 N. What is the heaviest weight that can be hung? ? Example #5. A cable that can withstand a maximum tension of 850 N is strung across two walls. A pulley is placed on the cable, and various masses are hung from the pulley, causing the cable to sag. Through trial-and-error, it is found that the cable can only sag 17° without breaking. What mass was used to cause this sag? 17° ? Example #6. Now we’ll take the previous example and vary it slightly. In the case below, the system is in equilibrium. Determine the unknown angle as indicated. ? 45 kg 120 kg Example #7. A smart physics student attempts to lift a heavy crate by using a lever system. She pushes on the lever with a force as shown below. What torque is created by this student? 75 N 28º 3.0 m Example #10. A physics student applies a horizontal force of 480 N in an attempt to move a 150 kg refrigerator, but unfortunately causes the fridge to tip over. Examining the diagram below, what is the net torque that causes the refrigerator to begin to topple over? 0.94 m Fapp = 480 N 1.9 m 1.6 m Example #11. A 5.0 kg uniform bar is attached to the wall as shown below, with a 2.0 kg weight hung in the indicated location. What minimum vertical force is needed to cause the system to be in rotational equilibrium? Example #13. A 8.00 kg uniform beam of length 3.00 m is attached to a wall by a hinge and is supported from the ceiling by a rope which makes an angle of 60º with the horizontal, as shown below. Calculate the tension in the rope that supports the beam. Example #16. Two students, Phreddie and Phreida Physics, are carrying Normie Neutron on each end of a 20.4 kg uniform plank that is 3.00 m long. If Normie’s mass is 51.0 kg and he is sitting 1.00 m from Phreida, how much lifting force does each student use to carry Normie? Hint: take the pivot at one end in order to remove the force supplied by one student from the situation. Example #17. What force, applied half way up the block, will just start the 22 kg block tipping? Example #18. A uniform 20.0 kg, 5.00 m-long ladder leans against a smooth (frictionless) wall as shown. Find: a) the normal force of the floor pushing up against the ladder; b) the normal force of the wall pushing against the ladder; c) the friction force between the ladder and the floor; d) the overall force that the floor exerts on the ladder. 60°