Sound, light, feelings and ideas are not considered to be matter. Which of the
following best explains why this is true?
A. None of these contain mass.
B. None of these can be measured.
C. All of these consist of atoms.
D. Each of these occupy space (have volume).

If a balloon is taken outside on a very cold day, what will occur?

During which interval are the persons represented by the graph not moving? a) 0 to 0.5 hrs b) 1.5 to 2 hrs c) 2 to 2.5 hrs d) 4.5 to 5 hrs

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?