Physical Science Investigating Sound Waves lab

pls help ;(

In a system, when potential energy decreases, then entropy also decreases. true false

Acapacitor is storing energy of 3 joules with a voltage of 50 volts across its terminals. a second identical capacitor of the same value is storing energy of 1 joule. what is the voltage across the terminals of the second capacitor?

What does the law of conservation of mass state?