سلك طوله 2 متر و معامل مرونته 2×10¹¹ نيوتن/م² وجد أن 4×10⁸ ، احسب اكبر استطالة في طول السلك دون أن يفقد مرونته؟

not too sure thinking it will always be directed towards the centre of the earth. could be wrong not sure

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )