Calculating Required Force to Tip a 27kg Box - Need Help Solving

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I can't solve this problem, can anyone help?

The problem I'm stuck on is:

You're trying to tip over a box. What is the amount of force you'd need to apply to it?

The box is 2.7 meters tall, .83 wide and weighs 27kg.

Anyone got an answer...?
 
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You need to make an attempt to solve the problem before anyone will help you ...

And this question belongs in "introductory physics".
 
depends where u apply force.
you can do by torqe balance about the tip point.
 
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