Answer:
50
Explanation:
The mechanical advantage of a machine is given by
[tex]MA=\frac{F_{out}}{F_{in}}[/tex]
where
[tex]F_{out}[/tex] is the output force
[tex]F_{in}[/tex] is the input force
For the crowbar in this problem,
[tex]F_{in}=10 N[/tex] is the force in input applied by the worker
[tex]F_{out}=500 N[/tex] is the force that the machine must apply in output to overcome the resistance of the window and to open it
Substituting into the equation, we find
[tex]MA=\frac{500}{10}=50[/tex]
