The principle states that the net electrical force on a specific charge is equal to the sum of
the vector components of the charges applying forces on it

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.

What is the speed of an object at a given moment?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?