The mass-energy equivalence formula is an example of the law of the conservation of
a. mass
b. energy
c. momentum
d. matter and energy

The a metal retainer that keeps the rolling elements evenly spaced. n a. seal n b. separator n c. bearing n d outer race

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.

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