9. According to Fourier's theorem, which of the frequencies in Question 7 will you likely need to add to make up the complex wave of Figure 7-30?
a) 2.5, 5.0, 7.5, ...,Hz
b) 2.5, 7.5, 12.5, . . . , Hz
c) 5, 10, 15, . . . , Hz
d) 5, 15, 25, ...,Hz
e) 10, 20, 30,...,Hz

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?

An equinox occurs when a. neither end of earth's axis is tilted toward or away from the sun. b. the north end of earth's axis is tilted away from the sun. c. the north end of earth's axis is tilted toward the sun. d. earth's axis is parallel to the sun's rays. select the best answer from the choices provided a b c d