The sodium D-line is formed by the transition of electrons from one energy state to another energy state, whereby the energy of atoms decreases by 3.37 · 10–19J. Determine the wavelength of the sodium D-line.

Ametal ball with a mass of 0.028 kg is dropped from rest at a height of 1.0 meters above the ground. assuming the energy in the ball is conserved, how much kinetic energy will the ball have when it is 0.5 meters above the ground?

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

The seven sisters, seven stars located more than 400 light-years away in the taurus constellation can be seen here with venus and another constellation, orion. the seven stars stay grouped together but seem to move, like the planet venus. why do stars seem to move like planets in the night sky?