A hot water tank loses thermal energy even when lagged. How could the enrgy loss be reduced?

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Two cars collide, lock bumpers and move together after the collision.this collision is known as perfectly inelastic collision.

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.