A man stands still on a moving walkway that is going at a speed of 0.2 m/s to the west. What is the velocity of the man according to a stationary observer?

Which of the following are correct values for the ideal gas laws constant r

The fact that the total amount of energy in a system remains constant is a(n)

The table lists the lattice energies of some compounds.compoundlattice energy (kj/mol)lif            –1,036licl            –853naf            –923kf            –821nacl            –786which statement about crystal lattice energy is  best  supported by the information in the table? the lattice energy increases as cations get smaller, as shown by lif and kf.the lattice energy increases as the cations get larger, as shown by lif and licl.the lattice energy decreases as cations get smaller, as shown by nacl and naf.the lattice energy decreases as the cations get smaller, as shown by naf and kf.