một vật dao đọng điều hòa với chu kì T và biên độ . Quãng dường lớn nhất vật đi được trong khoảng thời gian 5T/3

therefore, the efficiency is:

The answer is as follows in the photo

The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips.