Предмет: Физика, автор: kcailry

ПОМОГИТЕ ПОЖАЛУЙСТА! Тонкая спиральная пружина,для которой справедлив закон Гука,подвешенная вертикально на закреплённой опоре,растягивается под действием силы 160 Н на 72
мм.На пружину подействовали дополнительной силой 120 Н.Определите удлинение спирали.

Ответы

Автор ответа: Dianochka96
0
F=-kx
160=k*72*10^-3
k=160/(0,072)=160000/72=20000/9 (Н/м)
x=F/k
x=280*9/20000=252/2000=126/1000 (м)=126мм
Автор ответа: Amira009
0
F=kx. 160=0,072k, отсюда k=2222,2 Рассмотрим ситуацию, когда на дело действует дополнительная сила 120Н: 280=2222,2x, отсюда x=0,126 (в метрах) Ответ: 126 мм. 
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