1. a certain atom has 20 electrons, 21 neutrons, and 20 protons. what is
the atomic mass of the atom?

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above