- A man lost in a maze makes three consecutive dis- placements so that at the end of the walk he is back
where he started, as shown below. The first displace-
ment is 8.00 m westward, and the second is 13.0 m
northward. Use the graphical method to find the
third displacement.

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)

Why does lightning travel from clouds to the ground?