The work output of a machine divided by the work input is the of the machine?
a. efficiency
b. effort
c. power
d. resistance

Hello!

The work output of a machine divided by the work input is the efficiency (a) of the machine, which is given in percentage.

Hugs!

Ibelieve the answer is d. densityhope my answer has you : )

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.