What conditions are required for resonance to occur? a: a wave with the same frequency as an object's natural frequency b: a wave with the same amplitude as the object's natural frequency c: a wave with the same natural wavelength as an object's frequency d: a wave with the same natural frequency as an object's amplitude

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

The amount of heat required to change liquid water to vapor at its boiling temperature is 2256 kj/kg. the amount of heat required to change liquid mercury to its vapor state at its boiling temperature is 295 kj/kg. one kg of each substance is currently at its boiling point. how will the amount of thermal energy required to change each substance from a liquid to a gas differ?

The amount of potential energy possessed by an elevated object is equal to