Aballoon filled with helium gas has an average density of rhob = 0.27 kg/m3. the density of the air is about rhoa = 1.23 kg/m3. the volume of the balloon is vb = 0.084 m3. the balloon is floating upward with acceleration a.

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

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.

Drag each item into the proper state of matter category.