Two strings on a musical instrument are tuned to play at 392 Hz (G) and 494 Hz (B). Part C If the two strings have the same length and are under the same tension, what must be the ratio of their masses ( mG/mB)? Express your answers using three significant figures. ? mG %3D mB Submit Request Answer Part D If the strings, instead, have the same mass per unit length and are under the same tension, what is the ratio of their lengths (lG/lB)?

Simon drives to a restaurant where he notices that the door to the kitchen swings both in and out to allow serving staff to rapidly get to and from the kitchen. After a member of staff passes through the door it swings back and forth three times before coming to rest. The door is released a distance of 0.70 m from the frame and swings with a frequency of 0.40 Hz. b Draw a graph to show how the displacement varies with time until the door comes to rest. Include values where possible.

Please solve part d. Thank you for your help!!   An object is attached to the end of a vibrating spring and its displacement from its equilibrium position is y = 8e-t/2sin 4t, where t is measured in seconds and y is measured in centimeters. a. Graph the displacement function together with the functions y = 8e-t/2 and y = -8e-t/2. How are these graphs related? b. Use the graph to estimate the maximum value of the displacement. Explain whether or not it occurs when the graph touches the graph of y = 8e-t/2. c. What is the velocity of the object when it first returns to its equilibrium position? d. Use the graph to estimate the time after which the displacement is no more than 2 cm from equilibrium.

A piano tuner stretches a steel piano wire with a tension of 765 N. The steel wire has a length of 0.600 m and a mass of 4.50 g. Part A What is the frequency of the string's fundamental mode of vibration? Express your answer numerically in hertz using three significant figures. ΕΞΙ ΑΣΦ Submit Part B Request Answer 71= 2 What is the number n of the highest harmonic that could be heard by a person who is capable of hearing frequencies up to f-16 kHz? Express your answer exactly. 197) ΑΣΦ 4 Ha ?

please explain part d

Part A The ability to hear a "pin drop" is the sign of sensitive hearing. Suppose a 0.48 g pin is dropped from a height of 29 cm, and that the pin emits sound for 1.3 s when it lands. Assuming all of the mechanical energy of the pin is converted to sound energy, and that the sound radiates uniformly in all directions, find the maximum distance from which a person can hear the pin drop. (This is the ideal maximum distance, but atmospheric absorption and other factors will make the actual maximum distance considerably smaller.) Express your answer using two significant figures. km

A ladder is leaning against a vertical wall, and both ends of the ladder are at the point of slipping. The coefficient of friction between the ladder and the horizontal surface is µj = 0.155 and the coefficient of friction between the ladder and the wall is =0.153. Hz Determine the maximum angle a with the vertical that the ladder can make without falling on the ground. 18.6 Incorrect

Consider a sound wave in air that has displacement amplitude 2.40X10-² mm. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Amplitude of a sound wave in air. Part A Calculate the pressure amplitude for frequencies of 158 Hz . Take the bulk modulus of the air to be 1.42 × 105 Pa and the speed of sound to be 344 m/s Express your answer in pascals. pmaz = |98.30 Part B Submit Previous Answers Request Answer Be x Incorrect; Try Again; 4 attempts remaining pmaz = |983 Calculate the pressure amplitude for frequencies of 1580 Hz. Take the bulk modulus of the air to be 1.42 × 105 Pa and the speed of sound to be 344 m/s. Express your answer in pascals. Part C ? Be pmax = |9830 Pa Submit Previous Answers Request Answer (3 ? x Incorrect; Try Again; 5 attempts remaining Re 6 Calculate the pressure amplitude for frequencies of 1.58x104 Hz . Take the bulk modulus of the air to be 1.42 × 105 Pa Express your answer in pascals. Pa #3 ? Pa Submit Previous…

A Kundt's tube is filled with helium gas. The speed of sound in helium at 20°C is 999 m/s. A tuning fork that produces sound waves with frequency 1200 Hz is used to set up standing waves inside the tube. You measure the node-to-node distance to be 47.0 cm ▾ Part A What is the temperature of the helium gas in the sube? Express your answer in degrees Celsius. T = VG AZO Submit Request Answer Provide Feedback ? C

Question 7 Naturalists discovered a new species of rodent that lives in caves. The rodent's eyes do not function. Instead, it emits high pitched sounds and uses the reflections of those sounds to find its way around. What term best describes how the new rodent navigates its world? A intensity B echolocation C harmonics D Doppler effect