2. A pulley system is used to lift a 2000 N grand piano a distance of 3 meters. The mover applies 300 N of force in the process. a) Calculate the mechanical advantage of the pulley system. b) How much work does the machine do? c) If the mover pulls 27 meters of rope to lift the piano, how much work does he do? d) What is the efciency of the pulley system? Q a) 7 b) 6000 J c) 8000 .J d) 75% Q a) 4 b) 3000 J c) 9000 .J 0) 35% O a) 9 b) 3000 J c) 6000 .J 0) 55% Q a) 14 b) 8000 J c) 6000 .J d) 75% 7. A machine is designed to lift an object with a weight of 12 newtons. If the input force for the machine is set at 4 newtons, what is the mechanical advantage of the machine? 9. What do machines do? 0 Decrease the amount of work that is done. O Change the amount of force you exert or the distance over which you exert the force. O Eliminate friction. O Increase the amount of work that is done. 1. A device consisting of only one part and changes the size or direction of a force is a O reaction mechanism O force driver 0 force mechanism O simple machine 12. Maria does 1000.0 J of work to lift a 98.0 N air conditioner a distance of 5.8 meters. What is the efficiency of the pulley system Maria uses? O 53% O 64% O 52% O 57%6. The number of times a machine multiplies effort is the 0 power of the machine O mechanical advantage O resistance of the machine O momentum of the machine 5. A simple machine that consists of a rope wrapped around a wheel is called a O pulley O wedge O lever O screw3. A machine uses an input force of 200 newtons to produce an output force of 800 newtons. What is the mechanical advantage of this machine? 1D. A gardener uses a shovel as a lever to lift a 200 N rock a distance of 0.20 meters. He does this by applying 50 N of force to the end of the shovel. a) Calculate the mechanical advantage of the lever. b) How far down does the gardener push the shovel? O a) 40 b) 1.2 m O a)4b)0.8m O a)2b)0.8m O a)4b)0.4m 11. A machine with a mechanical advantage of 2.5 requires an input force of 120 Newtons. What output force is produced by this machine? 8. A machine is required to produce an output force of 600 newtons. If the machine has a mechanical advantage of 6, what input force must be applied to the machine? 4. A machine that utlizes two or more simple machines is called a 0 mixed machine O combination machine O compound machine 0 mechanical machine