On what bases are galaxies classified? a) density and volume b) mass and temperature c) shape and structure d) temperature and size

Which accounts for an increase in the temperature of a gas that is kept a constant volume

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius