Showing 261 to 270 of 327 Questions

A boat traveling at 10 m/s on a still lake makes a bow wave at an angle of 20o with its direction of motion. What is the speed of the bow wave?
0118 
A whistle of frequency 500 Hz moves in a circle of radius 1 m at 3rev/s. What are the maximum and minimum frequencies heard by a stationary listener in the plane of the circle and 5 m away from its center?
0118 
Ocean waves move toward the beach with a speed of 8.9 m/s and a cresttocrest separation of 15.0 m. You are in a small boat anchored off shore. (a) What is the frequency of the ocean waves? (b) You now lift anchor and head out to sea at a speed of 15 m/s. What frequency of the waves do you observe?
0154 
Two connected wires with linear mass densities that are related by μ1 = 3μ2 are under the same tension. When the wires oscillate at a frequency of 120 Hz waves of wavelength 10 cm travel down the first wire with the linear density of μ1. (a) What is the wave speed in the first wire? (b) What is the wave speed in the se
088 
A 12.0m wire of mass 85 g is stretched under a tension of 180 N. A pulse is generated at the left end of the wire, and 25 ms later a second pulse is generated at the right end of the wire. Where do the pulses first meet?
0132 
A harmonic wave moves down a string with speed 12.4 m/s. A particle on the string has a maximum displacement of 4.5 cm and a maximum speed of 9.4 m/s. Find (a) The wavelength of the wave, and (b) The frequency. (c) Write an equation for the wave function.
0134 
Find the speed of a car for which the tone of its horn will drop by 10% as it passes you. Let a = us/v.
087 
A loudspeaker diaphragm 20 cm in diameter is vibrating at 800 Hz with an amplitude of 0.025 mm. Assuming that the air molecules in the vicinity have this same amplitude of vibration, find (a) The pressure amplitude immediately in front of the diaphragm, (b) The sound intensity, and (c) The acoustic power being radiated.
0126 
A plane, harmonic, acoustical wave that oscillates in air with an amplitude of 106 m has an intensity of 102 W/m2. What is the frequency of the sound wave?
0134 
Water flows at 7 m/s in a pipe of radius 5 cm. A plate having an area equal to the crosssectional area of the pipe is suddenly inserted to stop the flow. Find the force exerted on the plate. Take the speed of sound in water to be 1.4 km/s. (Hint: When the plate is inserted, a pressure wave propagates through the water at the speed of sou
087