A 2.0 m first-class lever has a load of 600 N located 0.5 m…

A 2.0 m first-class lever has a load of 600 N located 0.5 m from the fulcrum.  (a)    State the Law of the Lever. [1] (b)    Draw a diagram of the lever, showing the load, effort, fulcrum, effort arm, and load. (you do not need to submit the diagram, but it may help you answer the questions) (c)    Determine the effort force needed to balance the load. [2] (d)    If this lever has an actual mechanical advantage of 2, determine the percent efficiency of the lever. [2]

If done long enough, rubbing two sticks together can produce…

If done long enough, rubbing two sticks together can produce enough heat to start a fire.  If 100.0 J of thermal energy is required to start the fire and the average frictional force between the sticks is 20.0 N, the distance the sticks must slide past one other is: