9. If the frequency of a certain light is 3.8 x 1024 Hz, what is the energy of this light?
1 answer:
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Answer:
The force is
Explanation:
The diagram for this question is shown on the first uploaded image
From the question we are told that
The weight of the gate is
The vertical component of F is
From the diagram , taking moment about the pivot we have
Where is the weight of the gate evaluated as
=>
=>
=>
