Figure 3 [6. A single movable pulley is being used to
move a 140 N load. The pulley is a little dirty,
so it adds another 5 N of frictional force.
(a) Can this load be moved with a 75 N input
force? Explain your answer.
(b) Would a single fixed pulley work? Explain
your answer. ka
21. Thí
pag
(a)
(b
C
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Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.