Three boys are playing a seesaw. The first kid is 20 kg and seated to the left of the center of the board. The second boy is
25kg and is seated 1 meter to the right of the center. Thelast
boy is 15 kg, and seated on the right side of the second boy. If
the center of the mass of the kids is 0.58 to the right of the
center, the third kid is seated meter (s) to the right of the
center.

1. what is the relationship between wavelength and the penetrating power of an electromagnetic wave? a) the penetrating power has no relationship to the wavelength. b) the penetrating power increases as the wavelength increases. c) the penetrating power decreases as the wavelength increases. d) the penetrating power decreases as the wavelength decreases. 2. as ice melts and turns into water, the speed of sound through the material would most likely do what? justify your answer. a) the speed would not change because the material is always water. b) the speed of sound would increase because the density of water is less than that of ice. c) the speed of sound would increase because energy is added to ice in order to make it melt. d) the speed of sound would decrease because sound travels faster through solids than liquids. 3.which of these waves need a medium to travel through? a) sound b) x-rays c) infrared rays d) visible light