Why is the Exam Kracker physics chapter 3, Equilbrium, Torque and Energy so lame

[Lui Kang]

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It does a horrible job of explaining the concepts. Im doing the problems in the 1001 questions in physics book that coresponds with the chapter and Im totally lost. `Can somebody please explain problem 320 in EK 1001 Physics please. Im starting to get frustrated🙁.

 

[gettheleadout]

I can't say why it's lame, but EK Physics isn't very highly recommended around these parts... TBR (The Berkeley Review) Physics is gold.

 

[Night Hawk]

It does a horrible job of explaining the concepts. Im doing the problems in the 1001 questions in physics book that coresponds with the chapter and Im totally lost. `Can somebody please explain problem 320 in EK 1001 Physics please. Im starting to get frustrated🙁.

With springs and EK, assume work is conserved aka no change in internal energy, unless otherwis stated. So delta PE = delta KE...Prior to being released, the Jack-in-the-box only has potential energy. Upon it's release, all the PE is converted to KE. You should be able to figure it out from there.

Their response is adequate. This would be a good example of an easy independent question on one of the AAMC practice test. If this didn't help then reply and I'll go through it step by step.

 

[sotto voce]

With springs and EK, assume work is conserved aka no change in internal energy, unless otherwis stated. So delta PE = delta KE...Prior to being released, the Jack-in-the-box only has potential energy. Upon it's release, all the PE is converted to KE. You should be able to figure it out from there.

Their response is adequate. This would be a good example of an easy independent question on one of the AAMC practice test. If this didn't help then reply and I'll go through it step by step.

Also, the 1001 series never claimed to provide really great, long, detailed explanations. That's what content review is for.

 

[Night Hawk]

Also, the 1001 series never claimed to provide really great, long, detailed explanations. That's what content review is for.

Valid point