How to find the y-component of this vector

Ascientific blank must be testable and capable of being proven false?

If element x has 99 protons how many electrons does it have

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?