To open a soda can lid, you can apply a force of 50 N to a car key wedged under the lid. The car key applies a force of 390 N to the lid. What is the mechanical
advantage of using the car key to open the can lid?

7.8

Explanation:

Here, an effort of 50 N is applied at the car key and overcomes the resistance(or load) of 390 N at the lid.

mechanical advantage

=load/effort

=390 N/50 N

=7.8

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