Answer questions 4-11

4. [-/2 Points] DETAILS OBINPHYS8 6.Q.030. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An audio speaker producing a steady sound at an outdoor concert is 30 ft away from you. If you move to a position where the speaker is 84 ft distant, by what factor will the amplitude of the sound change? Af Need Help? Read It Submit Answer ] 5. [-/2 Points] DETAILS OBINPHYS8 6.P.001. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Two children stretch a jump rope between them and send wave pulses back and forth on it. The rope is 3.9 m long, its mass is 0.48 kg, and the force exerted on it by the children is 47 N. (a) What is the linear mass density of the rope (in kg/m)? kg/m (b) What is the speed of the waves on the rope (in m/s)? m/s Need Help? Read It Submit Answer 6. [-/2 Points] DETAILS OBINPHYS8 6.P.005. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A 4.8 Hz continuous wave travels on a Slinky. If the wavelength is 0.53 m, what is the speed of waves on the Slinky (in m/s)? m/s Need Help? Read It Submit Answer 7. [-/2 Points] DETAILS OBINPHYS8 6.P.007. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A wave traveling 87 m/'s has a wavelength of 4.6 m. What is the frequency of the wave (in Hz)? Hz Need Help? Read it Submit Answer 8. [-/2 Points] DETAILS OBINPHYS8 6.P.012. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A steel cable with total length 51 m and mass 140 kg is connected to two poles. The tension in the cable is 2,373 N, and the wind makes the cable vibrate with a frequency of 2 Hz. Calculate the wavelength of the resulting wave on the cable. Need Help? Read it Submit Answer ] 9. [-/2 Points] DETAILS OBINPHYS8 6.P.013. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER In a student laboratory exercise, the wavelength of a 42,300 Hz ultrasound wave is measured to be 0.813 cm. Find the air temperature (In K). Need Help? Read It Submit Answer ] 10. [-/2 Points] DETAILS OBINPHYS8 6.P.015. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A person stands directly in front of two speakers that are emitting the same pure tone. The person then moves to one side until no sound is heard. At that point, the person is 5.65 m from one of the speakers and 5.67 m from the other. What is the frequency (in Hz) of the tone being emitted? (Assume air temperature to be 20 C.) Hz Need Help? Read It Submit Answer 11. [-/2 Points] DETAILS OBINPHYS8 6.P.017. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A sonic depth gauge is placed 3.9 m above the ground. An ultrasound pulse sent downward reflects off snow and reaches the device 0.019 seconds after it was emitted. The air temperature is -20 C. (a) How far (in m) is the surface of the snow from the device? (Round your answer to at least three significant figures.) m (b) How deep (in m) is the snow? Need Help? Read It Submit