Why aren't hydrogen fuel cells currently available to the public

If a bottle of olive oil contains 1.4 kg of olive oil, what is the volume, in milliliters ( ml ), of the olive oil?

Describing intermolecular forces use the drop down menus to match the type of intermolecular force to its name dipole dipole interactions dipole induced dipole interactions london dispersion forces hydrogen bond van der waals forces done

When a device is used in a circuit in which the voltage is 81 v the current flowing through the device is 3 a what is the resistance of the device