Question

A.) A stationary boat in the ocean is experiencing waves from a storm. The waves move at 59 km/h and have a wavelength of 170 m . The boat is at the crest of a wave. How much time elapses until the boat is first at the trough of a wave?

B.) A large solar panel on a spacecraft in Earth orbit produces 1.6 kW of power when the panel is turned toward the sun. What power would the solar cell produce if the spacecraft were in orbit around Saturn, 9.5 times as far from the sun?

C,) Table 15.3 in the textbook gives an estimate for the sound intensity of a whisper at 1.0 m. What is the sound intensity of a whisper at a distance of 2.5 m , in W/m2?What is the corresponding sound intensity level in dB?

D,) A concert loudspeaker suspended high off the ground emits 39 W of sound power. A small microphone with a 1.0 cm2 area is 46 m from the speaker.

a.What is the sound intensity at the position of the microphone?

b.What is the sound intensity level at the position of the microphone?

Answer 1