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Please answer my question :-)

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

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?

Difference between natural and artifical magnet