7. A capacitor of capacitance 500 uF is charged to V volts. It is then
discharged through a small coil of resistance wire embedded in a
thermally insulated block of specific heat capacity 2.5 x 102 Jkg 'K' 9.
and of mass 0.1 kg. If the temperature of the block rises by 0.4K,
what is the value of V?
​

Honestly "global warming" may be a slight possiblity, however they called it "climate change" because its not real, in fact we had one of our coldest days here not too long ago, and the "issues" with this subject is a blindfold for actual problems.

Not what goes around on earth but the universe too.

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.