I"m impressed. Ch. 8 Think & describe Answers: (a) (left-hand diagram) Mechanical benefit = 1, due to the fact that the force-to-fulcrum distance equates to the load-to-fulcrum distance. (b) (middle diagram) Mechanical benefit = 2, since the force-to-fulcrum distance is double the load-to-fulcrum distance. (c) (b) (right-hand diagram) Mechanical benefit = 0.5, due to the fact that the force-to-fulcrum street is fifty percent the load-to-fulcrum distance. The power released by a atom reactor is atom potential energy, or mass (E = mc2). Energy is conserved in a atom reactor. Ch. 8 Think & settle Answers: Ok, a liter that gasoline has 40 MJ (mega-joules) that energy. If the engine is 25% efficient, the engine will produce (0.25)(40 MJ) = 10 MJ of helpful work. If that appears a little bit "slick", below are the details:
This 10 MJ of energy can do work to actually relocate the car. The engine will need to generate a force of 1000 N to relocate the vehicle at constant velocity. Since W = Fd,(10 MJ) = (1000 N)(d)d = 10 000 m = 104 m = 10 km. The mechanical benefit of the pulley system on the best is 2. I really don"t prefer to take into consideration pulleys to be levers, but notice that there space 2 ropes lifing the object.

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Therefore, the stress and anxiety in each rope equals fifty percent the load of the object. You have to use a pressure of 0.5W come lift a load W, so the mechanical benefit is: MA = (Forcewithout)(Forcewith) = 2