Why do different pigments reflect different frequencies of light?

Calculate the kinetic energy of earth due to its spinning about its axis. krot = j compare your answer with the kinetic energy of the orbital motion of earth's center of mass about the sun. assume earth to be a homogeneous sphere of mass 6.00 1024 kg and radius 6.40 106 m. the radius of earth's orbit is 1.50 1011 m.

If steel is more dense that lake water, why can a boat float

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?