FE practice exam Q56

Question

FE practice exam Q56

GregLocock (Automotive)

(OP)

6 Jan 21 23:47

It seems to me the plug and chug answer is wrong, they should have used an energy balance 1/2*k*x^2=1/2*m*v^2 and got the answer A. They've assumed constant acceleration. I've checked it two ways, pity they didn't.

Cheers

Greg Locock

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dvd (Mechanical) · Answer 1 · 2021-01-07 00:29:34

I like the energy approach. No mention made of orientation - sketch shows horizontal, but...

3DDave (Aerospace) · Answer 2 · 2021-01-07 00:35:35

That's disturbing. You apparently inked in the errata fix.

For further info: https://ncees.org/wp-content/uploads/FE-Other-Disc...

csk62 (Mechanical) · Answer 3 · 2021-01-07 01:50:55

Quite a few NCEES problems are awful in my opinion, one immediately comes to mind on the practice PE exam. There are actually a few errors in the PE formula handbook as well on something as simple as beams. Just took the PE exam last month and the questions seemed better than the FE exam at least.

I like the energy approach on this one.

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Not making a decision is a decision in itself

GregLocock (Automotive) · Answer 4 · 2021-01-07 02:52:58

What interests me is that they've actually worked out the correct approach - A is the right answer.

Cheers

Greg Locock

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FE practice exam Q56